Question

Can some one explain the step of the following:

1. Graph the system of Inequalities (What will be the points)
y>= -4
x>=5


2. Solve by the substitution method
5x+3y= 7
x=59-7y

3.Graph the equation using the slope and the y-intercept (What are the points)
y= 4/3x+3

Thanks....