First you have to isolate one of the equations for y=mx+b.
Then substitute the equation is made into the first equation
Find x
5x-17 = 3x + 1
5x -3x = 17 + 1
2x = 18
2x/2 = 18/2
X = 9
Find the measure of FG
mFG = 5x - 17
mFG = 5(9) - 17
mFG = 45-17
mFG = 28
PLOT:
-2, 0.022
-1, 0.067
0, 0.2
1, 0.6
2, 1.8
Increasement percentage = 52%
original quantity = 40
so if 52% is increased then,

here you go