2 years ago

Solve the system of equations by substitution y=-2x+18 and 4y-x+9=0

Mathematics

1 answer:

Stells [14]2 years ago

3 0

Answer:

x = 9

y = 0

Step-by-step explanation:

y = -2x + 18

4y - x + 9 = 0

4(-2x + 18) - x + 9 = 0

- 8x + 72 - x + 9 = 0

- 9x + 81 = 0

81 = 9x

x = 81 : 9

x = 9

y = - 2×9 + 18

y = - 18 + 18

y = 0

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