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
Multiply the 1st equation by 2, subtract the 2nd equation
4x + 10y = -44
4x - 3y = 8
------------------subtraction eliminates x, find y
13y = -52
y = {{{(-52)/13}}}
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 = {{{(-4)/4}}}
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