SOLUTION: I need step-by-step instructions on how to solve systems of equations by elimination. for ex. 2x + 5y = -22 4x - 3y = 8 also i need to know if youh graph this one or n

Algebra ->  Expressions-with-variables -> SOLUTION: I need step-by-step instructions on how to solve systems of equations by elimination. for ex. 2x + 5y = -22 4x - 3y = 8 also i need to know if youh graph this one or n      Log On


   

Question 263066: I need step-by-step instructions on how to solve systems of equations by elimination.
for ex.
2x + 5y = -22
4x - 3y = 8
also i need to know if youh graph this one or not
-4y +7c = -8
10x + 4y =8
if not why and if yes then how
pease help me im very confused.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
I need step-by-step instructions on how to solve systems of equations by elimination.
for ex.
2x + 5y = -22
4x - 3y = 8
Multiply the 1st equation by 2, subtract the 2nd equation
4x + 10y = -44
4x - 3y = 8
------------------subtraction eliminates x, find y
13y = -52
y = %28-52%29%2F13
y = -4
:
Find x using the 2nd equation, replace y with -4
4x - 3(-4) = 8
4x + 12 = 8
4x = 8 - 12
4x = -4
x = %28-4%29%2F4
x = -1
:
Check solutions in the 1st equation
2(-1) + 5(-4) = -22
-2 - 20 = -22; confirms the solutions
:
:
also i need to know if you graph this one or not
-4y +7c = -8
10x + 4y = 8
:
You have 3 variables, c, x, and y, not sure how you would graph it