markgodoy873 markgodoy873

12-04-2021
Mathematics

contestada

Solve the system of equations using substitution.
-4x-8y=40
y=-4

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colombusgirl colombusgirl

12-04-2021

x + y = 40

y = 9x

x + 9x = 40 (substitute 9x for y in 1st equation)

10 x = 40
x = 4

4 + y = 40 (substitute 4 for x in 1st equation)
y = 36

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