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Solve each system by substitution. (-3x + y = 20) (-5x - 7y = -10)
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5 votes
Solve each system by substitution.

(-3x + y = 20)
(-5x - 7y = -10)

User Anthony Roy
by
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1 Answer

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15x+5y=100 original equation
-5x-7(4.375)=-10
-5x-30.625=-10
-5x=20.625 15x+21y=30 y=4.125

-16=70


x=4.375
User Emrhzc
by
7.8k points
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