toxxicalexxis toxxicalexxis

24-03-2021
Mathematics

contestada

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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viktoria80 viktoria80

24-03-2021

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

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