Question about Texas Instruments TI-89 Calculator

Help I need help on solving equations like solve for z. x=zw-zt^2 Can anyone help me solve this?

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If I'm not misunderstanding you, this isn't an equation you need a calculator for, it's basic algebra. Factor out the z from the right side and divide x by the remaining binomial. That's as far as you can go with an equation like this unless you have specific values for these variables, unless this is a question from college Cal 3-4, which I have not yet completed.

Posted on Oct 28, 2008

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Posted on Jan 02, 2017

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Related Questions:

Solve the following equation for a. a^2 + b^2 c^2

There is nothing to solve here.You just have an expression with two letters; you have no equation to solve because you need an = sign.

Sep 07, 2013 | Office Equipment & Supplies

What ia the sulution of 3y-6x=-3

To find the solution, first find the value of y for each equation.
Then substitue one equation into the other so that you only the x variable left.
Then just solve for x.
Once you have a value for x, then you can easily solve for y.

So for the first equation:

3y - 6x = -3
3y = 6x - 3

y = 2x - 1

Now for the second equation:

2y + 8x = 10
2y = -8x + 10

y = -4x + 5

Since both equations equal y, they also equal each other, therefore:

2x - 1 = -4x + 5

Now just solve for x:

2x + 4x = 5 + 1
6x = 6

x=1

Now substitute x=1 into either original equation:

y = 2x - 1
y = 2 (1) - 1
y = 2 - 1

y = 1

Therefore the solution is x=1 and y=1

Good luck, I hope that helps.

Joe.

Nov 09, 2011 | Texas Instruments TI-84 Plus Silver...

I need straightforward key strokes for a casio fx115 es graphing calculator to solve linear equations. I have the Manuel but it only confuses me. this is an example of what I'm solving ...

This calculator doesn't really support a solver like that. You can use Woflram Alpha to solve equations like that really quickly. Example
There are more expensive calculators that will solve these types of equations, but I would recommend just using Wolfram Alpha whenever you need a solution to a math problem.

Mar 02, 2011 | Casio FX-115ES Scientific Calculator

7x-2y=1 y=3x

And your question is? If you just want to know how to solve this system, you only need to substitute one equation into the other and solve for the remaining unknown.

y=3x (equation 2), so plug it into equation 1

7x-2y=1
7x-2(3x)=1
7x-6x=1
x=1

from equation 2 then, you know y=3x=3

Oct 05, 2010 | Linear (HDMICAT5EXT) Repeater

I need to solve this problem, can anyone help? 2.5/7 = x/10 How do I get this calculator to do it?

It looks like overkill to use the calculator to solve this first order linear equation but I will show you how to use the Solve function available on this calculator.

First solution: Pen and paper.

Use the properties of proportions:
Let a, b, c, and d numbers, with b, and d not equal to 0
if a/b=c/d then a*d=b*c
To apply it to your case, you set a=2.5, b=7, c=x, and d=10.
This gives 2.5*10=7*x
Dividing both members of the equation by 7 yields x=25/7.

Using the SOLVE program
1. Calculator should be in computational mode: Press [MODE][1:COMP]
2. Type in the equation in the way described below:
3. You will need to use the key sequence [ALPHA][CALC] (=) to insert the = sign, the one at the top left, not the one at the bottom right.
4. You will need to use the sequence [SHIFT][CALC] (SOLVE) to order the calculator to start solving your equation.
5. You will need the key sequence [ALPHA] [)] to insert the X variable.
6. Now that you have been alerted to the sequaences you will need, here is how to enter your equation.
7. 2.5/7 [ALPHA][CALC] (=) [ALPHA] [ ) ] (X) /10
8. While the above sequence is in the command line with the cursor still blinking to the right of the 0, press [SHIFT][CALC] to access the (SOLVE) command.
9. The calculator displays in the top line of the dispaly "Solve for X". At the bottom there would be some old (irrelevant value).
10. At this point you are expected to enter a value for your initial guess.
11. You can for example enter 2 and press [=] at the bottom right. If you do not type a guess, the calculator uses the old (irrelevant) value as initial guess.
12. So you enter initial guess 2 and press the [=/EXE] key at the bottom.
13. After a while (could be short , if the initial guess is inspired) the calculator returns with the solution.
14. The solution display screen recalls your equation on the top line,
15. X=3.571428571 on the middle line, and
16. L-R= 0 on the bottom line.
The L-R=0, tells you that the difference between the LEFT side and the RIGHT side of your equation is 0. That means the X given in the second line is the solution within the tolerance of the calculator.

If you are not happy with the solution (L-R different from 0), or the calculator failed to return a solution, you can press [SHIFT][CALC] (SOLVE) to restart with a better guess.

Feb 10, 2010 | Casio FX-115ES Scientific Calculator

Solving a linear equation from TI30XS Multiview

Hello,
Sorry this calculator cannot solve equations. It does not have the program. It does not know how to do those things. However it can calculate. Before you can use the calculator you must prepare all yourself. When you have solved the problem, you ask the calculator to compute the value of what you found.

Let us clean the equation a bit
2(x-4) -5x=-5
Get rid of the parentheses 2(x-4) becomes 2x-2*4=2x-8 .Put that result where it was in equation
2x-8 -5x=-5
Group together the terms that have x in them 2x-5x=-3x
Then
2x-8-5x=-5, becomes -3x-8=-5
You want to isolate the term with x (have it on one side, and the others on the other side) -3x= -5 -(-8)= -5+8 =3.

The equation becomes
-3x=3 Thus -x=3/3=1 and x=-1.
In general you would have obtained x= (some number/some other number) and that is where the calculator would intervene.

Hope it helps.

Sep 11, 2009 | Texas Instruments TI-30XA Calculator

Solving systems of equations by elimination

Hi joanmae jmeh;

You can add these equations just like you would numbers

3x + 2y = 7
5x - 2y = 1
-----------------------
8x =8
x=1
Now plug x = 1 back into either equation and you can solve for y
Y = 2

When you add the 2 equations together the +2y and the -2y cancel
out

Hope this helps Loringh Please leave a rating for me Thks

Dec 01, 2008 | Bagatrix Algebra Solved! 2005 (105101) for...

Solve comlex equation

Hello,
I do not understand what you mean by solve complex equations, but if you want to manipulate complex numbers here are the tools you need to enter your complex numbers. Operations and function evaluations do not need special symbols.

Hope it helps.

Oct 31, 2008 | Casio FX-9860G Graphic Calculator

How to use ti 89 with a problem like "-(3x+1)-(4x-7)=4-(3x+2)'

Just plug in one side of the equation and find the answer. Then plug in the other side and compare answers.

Feb 19, 2008 | Texas Instruments TI-89 Calculator

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