Complete the equation of the line through (-8,-2)(−8,−2) and (-4,6)
Use exact numbers

Then you plug the rest into point-slope form (you can use either of the points, I used the first one)
y - y1 = m(x - x1)
Remember that m is the slope.
y + 2 = 2(x + 8)
Distribute the slope to the parenthesis
y + 2 = 2x + 16
Isolate the y variable
y = 2x + 14