Graph the two lines. The solution is the point where the two lines cross. Read the (x, y) coordinates of the crossing point from the graph.
To graph each line, find two points, plot them on the coordinate plane, then use a straight edge to draw the line through them. To find two points, just plug in any value of x then use the equation to find the corresponding value of y. For instance, if I choose x = 0, I get:
y = (3/4)x - 4 = (3/4)(0) - 4 = -4, so the (x,y) = (0,-4)