Need help solving for x, look at image above

Solve 2x+y=3 x+y=5 in substitution method

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.

Collin did the work to see if 10 is a solution to the equation r/4=2.4