Question

how do you work out the x value when the y value is
y=8.2
y=3x+1

Answer 1

Ehm, y is "fixated" at 8.2, now solve the linear equation 8.2=3x+1

Answer 2

how do i do that

Answer 3

it is written y = 8.2
now put this value of y in the second equation
8.2 = 3x +1
now rest is simple arithmatic ..

Answer 4

but using y=3x+1 how do you work out the x value when the y value is 8.2

Answer 5

You're using it, but your "y" has a numerical value, that's 8.2, the you just say it and replace it on your equation, then solve it.