Question

Solve for y: -5x + 2y – 1= 3
What is the value of y when x = 4?
y=

Answer 1

y=12

Explanation:

`-5x+2y-1=3`

Solve for y. Add 1 to both sides:

`-5x+2y-1+1=3+1\\-5x+2y=3+1\\-5x+2y=4`

Add 5x to both sides:

`-5x+5x+2y=4+5x\\2y=4+5x\\2y=5x+4`

Divide both sides by 2 to isolate y:

`(2y)/(2) =(5x)/(2)+(4)/(2)`

`y=(5x)/(2) +2`

Insert the value of x=4 :

`y=(5(4))/(2)+2`

Simplify:

`y=(20)/(2)+2`

`y=10+2\\y=12`

Finito.

Answer 2

12

Explanation: