Question

Complete the solution of the equation. fine the value of y when x equals 4.

-3x+9y=-57

Answer 1

-3(-4)+9y=-57

12+9y=-57

9y=-57-12

9y=-69

9y/9=69/9

y=-23/3

Answer 2

y = - 5

substitute the value of x = 4 into the equation and solve for y

- 12 + 9y = - 57 ( add 12 to both sides )

9y = - 45 ( divide both sides by 9 )

y =
`(-45)/(9)` = - 5