Question

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

Answer 1

• Answer:

x = 9

y = 0

• 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