Answer:
first, mark a point at x=0, y =3. This is the "y intercept"
A slope of -3/4 means that if you move 4 units in the + x direction, the y value will be 3 less. Thus, at x = 4, y = 0
You can get another point at x = -4. Here, y will be 3 units HIGHER than the starting point---i.e. +6
The equation of your line is y = -3x/4 + 3
plug in some other values of x to see the y value.
I believe this is the answer.