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three times a first number minus a second number equals negative forty The first number plus twice the second number equals negative forty
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three times a first number minus a second number equals negative forty The first number plus twice the second number equals negative forty

three times a first number minus a second number equals negative forty The first number-example-1
User Bubersson
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1 Answer

1 vote
2x-y=-40
x+2y=-40
Multiply the second equation by 2
2x+4y=-80
Subtract
2x-y=-40
2x+4y=-80
-5y=40
Decide by -5
y=-8

To find y, plug it back into an equation
x+2y=-40
x+2(-8)=-40
x-16=-40
x=-24
User Vladimir Mitrovic
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4.4k points
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