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

# Solving systems of equations by elimination

3x+2y= 7
5x-2y= 1 is my problem.

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• Anonymous Apr 21, 2009

6x-5y=47
3y=-7-2x

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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

Posted on Dec 01, 2008

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Solve 4x-2y=8

Posted on Mar 02, 2009

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(0,2)

Posted on Dec 31, 2008

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## Related Questions:

### How to solve equations with calculator

I'm not sure which calculator you are using, but the website desmos.com can be used as an online calculator. You would enter the two lines and where they intersect, it will tell you the coordinates.

Doing it manually, you could use the elimination or substitution method.

By the elimination method:

x + y = 7 (1)
x + 2y = 11 (2)
------------------
0 - y = -4 subtracting (2) from (1)
y = 4
Substituting into (1) x + 4 = 7

x = 3 After subtracting 4 from both sides

Checking in the second equation
LS RS
3 + 2 (4) 11
3 + 8 11
11 11
LS = RS
QED

Good luck,

Paul

Mar 08, 2018 | Homework

### How do I get this: Twice a number minus a second number is -1. Twice the second number added to three times the first number is 9. Find the two numbers.

Two equations:
x = first number
y = second number
2x - y = -1
y = 1 + 2x
2y + 3x = 9
2(1 + 2x) + 3x = 9
2 + 7x = 9
7x = 7
x = 1
y = 2(1) + 1 = 3

Oct 25, 2016 | Cars & Trucks

### Determine the x and y intercept of the graph for each equation. 5x-y=-5 And -3x+2y=7

5x-y=-5 answer x=-1, y= 5 http://www.wolframalpha.com/input/?i=Determine+the+x+and+y+intercept+of+the+graph+for+equation%3A+5x-y%3D-5

-3x+2y=7 answer x = -7/3, y = 7/2 http://www.wolframalpha.com/input/?i=Determine+the+x+and+y+intercept+of+the+graph+for+equation%3A+-3x%2B2y%3D7

Feb 23, 2015 | Office Equipment & Supplies

### How do I solve (3x-2y)2(3xy-3)

First, we will find y in terms of x. We will use the first equation to determine this.
4x+2y=2
We can subtract 4x from both sides:
2y=2-4x
And then divide both sides of the equation by two:
y=1-2x
Since we now have y in terms of x, we can substitute this into our second equation.
-3x-y=-3
-3x-(1-2x)=-3
Then, we can distribute the minus sign
-3x-1+2x=-3
-x-1=-3
Next, we can add 1 to both sides of the equation.

-x=-2
Finally, we divide both sides by negative one to isolate x.
x=2
Now that we have x's value, we can find y's value.
The first thing that we determined is:
y=1-2x
We can substitute in the value of x to this equation.
y=1-2x

y=1-4
y=-3
Therefore, we now have the values of both variables.
x=2
y=-3

Jan 13, 2015 | SoftMath Algebrator - Algebra Homework...

### 2x -y +z -w = -1 x +3y -2z = -5 3x -2y +4w = 1 -x +y -3z -w = -6 solve for the variables w,x,y,z using matrix equation

You have to put the equations into matrix form first. To do this, each variable has one column in the first matrix and you fill in the co-efficients for the variables. The second matrix has one column and contains all the numbers.

{ 2 -1 1 -1} = Matrix A
{ 1 3 -2 0}
{ 3 -2 0 4}
{-1 -3 -3 -1}

{-1} = Matrix B
{-5}
{ 1}
{-6}

{x=-2} = A*(B^-1)
{y=-.2}
{z=3}
{w=1/6}

I used excel for all my calculation and a helpful tutorial can be found here. I hope this helps and have a nice day!

May 05, 2011 | Computers & Internet

### 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

### X-3y=5 3x-2y=1

2y - x = 3
x = 3y - 5

Add the two equations side by side,

2y - x + x = 3 + 3y - 5

2y = 3y - 2

y = 2

Plug this in the second equation to get x,

x = 3(2) - 5

x = 1

So the solution is x = 1, y = 2

or in ordered pair notation (1, 2)

Jun 29, 2009 | Computers & Internet

### Find the y coordinate in the solution of -3x+y=5 if x=1

This is the process of how you would solve this.

-move the -3x over to the right hand side, so you have:
y = 5 + 3x

- since you know what x is, plug in the x which is 1:
y = 5 + 3(1)

- solve the equation
y = 5+3

y = 8, so the solution is 8.

Dec 16, 2008 | SoftMath Algebrator - Algebra Homework...

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