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Solve the system using the substituion method -4x+y=8 x-3y=9
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4 votes
Solve the system using the substituion method
-4x+y=8
x-3y=9

User Joseph Dattilo
by
7.9k points

1 Answer

4 votes
Hi there!

x - 3y = 9
x = 9 + 3y

-4x + y = 8
-4(9+3y) + y = 8
-36 - 12y + y = 8
-36 - 11y = 8
-11y = 44
-y = 4
y = -4

x - 3y = 9
x - 3(-4) = 9
x + 12 = 9
x = 21

So, your answers are y = -4 and x = 21.

Hope this helps!
User Tesseract
by
8.0k points
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