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A variable needs to be eliminated to solve the system of equations below. Choose the correct first step. -3x - 9y = 36 X - 9y = 12
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5 votes
A variable needs to be eliminated to solve the system of equations below. Choose the

correct first step.
-3x - 9y = 36
X - 9y = 12

User Supun Praneeth
by
4.4k points

1 Answer

4 votes
Two different things u can do
Substitution:
X-9y=12
+9y +9y
X=9y+12

-3(9y+12)+9y=36
-27y-36+9y=36
+36 +36
-18y = 72
/-18 /-18
Y = -4


Or whatever this other I’ve is called

-3x-9y=36
-1(X-9y)=(12)-1

-3x-9y=36
-x+9y=-12

-4x=24
X= -6
User Dhanesh
by
5.0k points
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