Question

Solve using substitution. y = -4x + 5 y = x + 10

Answer 1

Lets turn the last equation into something x equals.

x = y - 10.

y = -4(y - 10) + 5

y = -4y + 40 + 5

y = -4y + 45

-5y = -45

y = 9

9 = -4x + 5

0 = -4x - 4

4x = -4

x = -1

The pair is (-1, 9) (x = -1, y = 9)

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Answer 2

Answer:

x=-1

Step-by-step explanation:

y=-4x+5

y=x+10

------------

-4x+5=x+10

-4x-x+5=10

-5x=10-5

-5x=5

x=5/-5

x=-1