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Please help I don't understand this: Solve using substitution: -3x - 4y = 2 x + 2y = 2

Please help I don't understand this: Solve using substitution: -3x - 4y = 2 x + 2y = 2
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1 vote
Please help I don't understand this:

Solve using substitution:
-3x - 4y = 2
x + 2y = 2

User Bobzhang
by
8.8k points

1 Answer

1 vote
Change second equation
x + 2y = 2
x = -2y + 2
Plug that into first
-3(-2y + 2) - 4y = 2
6y - 6 - 4y = 2
2y = 8, y = 4
Plug in 4 for y
-3x - 4(4) = 2
-3x - 16 = 2
-3x = 18, x = -6
The answer: x = -6, y = 4
User Noman Pouigt
by
9.1k points
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