The equation would be y=-3/4x+8
Step-by-step explanation
Since the line passes through the point (-8,-2) and the slope is -3/4 go down 3 points and to the right 4 points from the point (-8,-2) which would equal m. Your line should then pass through -8 on the y-axis which equals b.
Slope-intercept form
Y=mx+b
m= slope
b= y-intercept
Let me know if I was wrong. Hope I helped!