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2x = 3y + 13
4x + y = 15
2(3y + 13) + y = 15
6y + 26 + y = 15
7y = 15 - 26
y = - 11/7
2x - 3y = 13
2x - 3(-11/7) = 13
2x = 13 + 33/7
2x = 91/7 + 33/7
x = 124/7 ÷ 2
x = 124/ 14
x = 62/7