The total cost c( in dollars) to participate in a ski club is given by the literal equation c=85x+60, where x is the number of ski trips you take

I'm not quite sure what you're finding for in this problem. Since you gave a general equation, all I can do is provide a graph for it. To graph the equation, assign values of x, then you get corresponding values of C. Plot these points on the positive x and y axes of the Cartesian plane. The x-axis is for the number of ski trips, and the y axis is the total cost. The graph is shown in the attached picture.