Which of the following functions is graphed below? Please help im taking a super hard test

Me find the measure to side c and the process to solve the problem you appreciate it : )

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)

What is the slope of the line that contains the points (-2,1) and (0,-3)