2x times y is written 2xy. This means all three of these numbers multiplied together.
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The result of the equation x + 2y - 2x - y equals x simplifies to y - x.
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I presume you mean given y find x: Make x the subject: y = 2x + 3 => 2x + 3 = y => 2x = y - 3 => x = (y - 3)/2 which can also be expressed as: x = 0.5 y - 1.5
y = f(x) = (2x + 1)/(x - 1)y*(x - 1) = (2x + 1) xy - y = 2x + 1xy - 2x = y + 1x(y - 2) = y + 1so x = (y + 1)/(y - 2) assuming y�2.So the inverse function is f-1(x) = (x + 1)/(x - 2)
If you mean: (2x-7y)(x+y) then it is 2x squared -5xy -7y squared