Question

For the equation y = -7x + 4:
a) Explain how to change the equation so the line has a greater slope, then a lesser slope.
b) Explain how to change the equation so the line has a greater y-intercept, then a lesser y-intercept.
c) Re-write the equation so the new line has a y-intercept that is one less than the given y-intercept, and a slope that is one more than the given slope.
Can someone help me do this?? I'm lost on how to do this