a). First put the equations in terms you are used too.
f(x) = 1.25x + 20
g(x) = 1.25x + 10
they are linear (straight lines) and they are 10 units apart.
f(x) goes through (0, 20)
and g(x) goes through (0, 10)
f(1) = 1.25 + 20 = 21.25 (1,21.25)
g(1) = 1.25 + 10 = 11.25 (1, 11.25)
There are the 2 point for each function to graph them.
b). The lines are parellel.
c). make the constant equal. (20 and 10)
d). the function would now be
F(x) >= 1.25(x + 150)
F(x) >= 1.25x + 187.50
It would be the line and all the values above it
It would start at (0, 187.50)