Question

Solve the equation for y. then find out the value of Y when X = 3. problem
-2y + 7x = 9

Answer 1

y = 6

Explanation:

given

- 2y + 7x = 9 ( subtract 7x from both sides )

- 2y = - 7x + 9 ( divide through by - 2 )

`(-2)/(-2)` y =
`(-7)/(-2)` x +
`(9)/(-2)` ( simplify )

y =
`(7)/(2)` x -
`(9)/(2)`

or

y = 3.5x - 4.5

substitute x = 3 into the equation

y = 3.5(3) - 4.5 = 10.5 - 4.5 = 6