I have two Calculus problems I need explained because I'm studying for a final exam and I forgot how to do these things: #1: Find the point that lies on the line determined by the points (1,-2) and (-3,1). The answer is (5,-5), but I don't know why.... #2: Write an equation satisfied by the graph obtained by shifting y=2x-5 three units to the left. The answer is y=2x+1 I know when an equation is shown moving to the left, it is put in parentheses and a number is added to it (for example y=x^2 becomes y=(x^2+2) when it is moved two places to the left). However, I do not know how to do this problem. Could someone please help me?