Question 238884: x - 9y = 101
x - 7y = 75
Answer by unlockmath(1688)   (Show Source):
You can put this solution on YOUR website! Hello,
Let's first multiply the first equation by -1 (note you could multiply the first or second equation)
(-1)x (-1)(- 9y) = (-1)101 This will then be:
-x +9y = -101 Now we can add it to the second equation.
x - 7y = 75 Notice the x cancels out leaving us with:
2y = -26 Divide both sides by 2 which gives us:
y= -13 Plug this into the original equation to find x.
x = -16
RJ Toftness
www.math-unlock.com
|
|
|
