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y - 1
Subtracting y = x + 1 from y = 2x - 1 gives 0 = x - 2; whence, x = 2, which is your answer.
x = 3 y = 4 2x + y - 1 = (6) + (4) - 1 = 9
x = -1/3 and y = 7/12
If y equals 5x-15 and x equals 1 then the value of y comes out to be -10. So y equals 5x-15 is -10.