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3x+3=3y
2x-6y=2

(Solving Systems Of Linear Equations By Elimination)

Sagot :

3x+3=3y ⇒ 3y-3x=3 ⇒3(y-x)=3 ⇒ y-x=1
2x-6y=2 ⇒ 2(x-3y)=2 ⇒ x-3y=1

We must to collect two equations.
x's is lost;
y-3y=2
-2y=2
y=-1   ; x-3.(-1)=1  ⇒ x=-2

Answer is (-2,-1)
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