A pipeline for transporting oil will connect two points A and B that are 3 miles apart on opposite banks of a straight river that is 1 mile wide. Part of the pipeline will run under the water from point A to a point C on the opposite bank, and then above ground from point C to point B. If the costs per mile for running the pipeline under the water is 4 times the cost per mile of running it above ground, find the location of point C that will. minimize the total cost.

Look at this system of equations. -3x + 3y = 12 y = x + 4 the solution set of this system is best explained by which of these statements? a) the graphs of the equations are the same line because the equations have the same slope and the same y-intercept. the system has infinitely many solutions. b) the graphs of the equations are parallel lines because they have the same slope but different y-intercepts. the system has no solution. c) the graphs of the equations are lines that intersect at one point because the equations have the same slope but different y-intercepts. the system has exactly one solution. d) the graphs of the equations are lines that intersect at one point because the equations have the same slope and the same y-intercept. the system has exactly one solution.