5x+2y=22. -2x+6y=3 what is the x coordinate of the solution. round to the nearest tenth

Multiply first example by 3 and subtract by second example, you will get the following:

3*(5x + 2y) = 3*22   =>  3*5x + 3*2y = 66      =>  15x + 6y = 66
now subtraction:
(15x + 6y) - (-2x + 6y) = 66 - 3
15x + 6y + 2x - 6y = 63
15x + 2x + 6y - 6y = 63
17x = 63
x = 63/17 ≈ 3.705 and as it says to round to the nearest tenth our answer would be: x = 3.7

J= r + 9 because since jessica rode 9 more miles than roger, you add 9 miles to rogers mileage.