X - Y = 2
When X = 3 you have 3 - Y = 2
Moving Y to RHS: 3 = Y + 2
Moving 2 to LHS: 1 = Y
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If 3x -5y = 16 and xy = 7 then by combining both equations into a single quadratic equation and solving it then the points of intersection are at (-5/3, -21/5) and (7, 1)
1+3x=10
-2
3/2
y=-2x+3 is an equation. It does not have an answer. If the question is "what if y=0?" then the answer is x=3/2.