3y+5=x and x=y+1 prove x=-1 and y=-2

How do you do this proof?
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we have 3y+5=x (1)  and  x=y+1 (2) we substitute to the (1) where x=y+1 and we get 3y+5=y+1 ---->>>

3y-y=1-5  ---->>>  2y=-4   so  y=-4/2 = -2  putting this value of y to the (2) we get  x=-2+1=-1
by Level 5 User (13.1k points)

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