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-3x+3y=3 -5x+y=13 Solve for substitution
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4 votes
-3x+3y=3
-5x+y=13
Solve for substitution

User ZacharyP
by
8.3k points

1 Answer

5 votes
Take -5x + y =13 and rearrange for y:
y=13+5x

Substitute into other equation for y:
-3x+3(13+5x)=3

Multiply out brackets:
-3x+39+15x=3

Simplify:
12x+39=3

Rearrange for x:
12x=-36
x=-3

Substitute back into y=13+5x:
y=13+5(-3)
y=13-15
y=-2

User Christian Jensen
by
7.8k points
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