y=(1-x)(9-x)

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Solution for y=(1-x)(9-x) equation: 


Simplifying
y = (1 + -1x)(9 + -1x)

Multiply (1 + -1x) * (9 + -1x)
y = (1(9 + -1x) + -1x * (9 + -1x))
y = ((9 * 1 + -1x * 1) + -1x * (9 + -1x))
y = ((9 + -1x) + -1x * (9 + -1x))
y = (9 + -1x + (9 * -1x + -1x * -1x))
y = (9 + -1x + (-9x + 1x2))

Combine like terms: -1x + -9x = -10x
y = (9 + -10x + 1x2)

Solving
y = 9 + -10x + 1x2

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Simplifying
y = 9 + -10x + 1x2

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