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

1 answer:

4 0

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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