Question about Bagatrix Algebra Solved! 2005 (105101) for PC

# Solving systems of equations by elimination

4x+8y=20
-4x+2y=-30

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Linear Equation: yearly profits: In news reports, profits of a compagny this year (T) are often compared with those of last year (L), but actual values of T and L are not always given. this year , a company had profits of \$25 million more than last year. the profits were up 30%. determine T and L from these data. 2nd Question: INVESTMENTS
A total of \$35,000 was invested at three interest rate: 7,8, and 9%. The interest for the first year was \$2830, which was not reinvdeste. The second year the amount originally invested at 9% earned 10% instead, and the other rates remained the same. The total interest the second year was \$2960. How much was invested at each rate?

Posted on Oct 19, 2010

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X=7
y=-1

Posted on Feb 17, 2009

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4x+8y=20
-4x+2y=-30

Posted on Mar 10, 2009

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Posted on Jan 02, 2017

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## Related Questions:

### 8x + 3y = 3 4x + 5y = -23

This is best written as two separate equations:

8x+3y = -23 and 34x+ 5y = -23
Solving the first one for x:
8x = -23-3y
x = -23/8 - 3/8y
Substituting this value for x into the second equation:
34(-23/8 - 3/8y) + 5y = -23
-97.75 - (34)(.375)y + 5y = -23
-97.75 - 12.75y + 5y = -23
-97.75 -7.75y = -23
-7.75y = 97.75-23=74.75
y = -74.75/7.75 = -9.645161
Substitution back into the equation for x:
x = -23/8 - 3/8(-9.645161)
x = -2.875 + 3.616935
x =.741935

Dec 12, 2014 | Bagatrix Algebra Solved! 2005 (105101) for...

### How to use texas instruments ti-84 plus to plot inequality 4x+8y&lt;40?

First step is to find inequality in the form y<f(x), in this case y<5-0.5x. Then graphing it. See captured image

Feb 18, 2011 | Texas Instruments TI-84 Plus Silver...

### This is a two equation problem in which you have to eliminate one variable to find value of other, solve by elimination method, 2r-3s=-10 & 3r 2s=37

Given "2R-3S=-10", then "6R-9S=-30".
Given "3R 2S=37", then "6R 4S=74".

Subtract the two equations: "6R-6R 4S --9S = 74 --30",
which reduces to: "4S --9S=104".
Note that 'R' has been eliminated from the equation, as requested.

Solving for 'S' is left as an exercise for the reader.

Sep 03, 2010 | MathRescue Word Problems Of Algebra Lite

### Find the value of the variable ''x'' 6x+6=4x+12

6x+6=4x+12
Since 4x contains the variable to solve for, move it to the left-hand side of the equation by subtracting 4x from both sides.
6x+6-4x=12
Since 6x and -4x are like terms, add -4x to 6x to get 2x.
2x+6=12
Since 6 does not contain the variable to solve for, move it to the right-hand side of the equation by subtracting 6 from both sides.
2x=-6+12
Add 12 to -6 to get 6.
2x=6
Divide each term in the equation by 2.
(2x)/(2)=(6)/(2)
Simplify the left-hand side of the equation by canceling the common factors.
x=(6)/(2)
Simplify the right-hand side of the equation by simplifying each term.
x=3

Good Luck

Sep 10, 2009 | Audio Players & Recorders

### 4x+8y=20 -4x+2y=-30

4x+8y=20 || /4
x+2y=5
x=5-2y

-4x+2y=-30 || /2
-2x+y=-15
-2(5-2y)+y=-15
-10+4y+y=-15
5y=-5
y=-1

x=5-2y || y=-1
x=5-2(-1)
x=5+2
x=7

Mar 10, 2009 | Bagatrix Algebra Solved! 2005 (105101) for...

### IF I HAVE TWO equations 5x+8y=54, AND -9x+y=26 how do i solve

use the simultaneous equation solver software available on ur ti-89 and enter the equation in the form of augmented matrix and you will get ur answer.

Dec 03, 2008 | Texas Instruments TI-89 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...

### Determining the equation of the parabola

V (2,0) and Focus (2,2)
since the focus is 2 units above the vertex, the parabola opens upward

vertex (h,k)
a is the focal length (distance between the vertex and the focus)
a = 2
(2 units above the vertex)

(x-h)^2 = 4a (y-k)
(x-2)^2 = 4(2) (y-0)
x^2 - 4x + 4 = 8 (y)
x^2 - 4x + 4 = 8y
x^2 - 4x - 8y + 4 = 0

**Answer: "(x-2)^2 = 8 (y)" or in expanded form "x^2 - 4x - 8y +4"

Nov 18, 2008 | Super Tutor Trigonometry (ESDTRIG) for PC

### 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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