Question

Please help me! I can’t find the right equation. Thank you!!

Answer 1

Y=mx+c where m is the gradient.
If the equation is perpendicular is -$\frac{3}{4}$

Use y-y1=m(x-x1)
and you should get 
y+1=-$\frac{3}{4}$ (x+4)
4y+4=-3x-12
y=-$\frac{3}{4}$x - 16