Let line 1 be the graph of 5x+8y=-9. Line 2 is perpendicular to line 1 and passes through the point (10,10). If line 2 is the graph of the equation y=mx+b, then find m+b.
Put given line into y = mx + b form to find m = -5/8
perpindicular is - 1/m = 8/5
then using 10,10
y- 10 = 8/5 (x-10) re-arrange this into y = mx + b form to compute your final answer