y-x=-9x+21

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Solution for y-x=-9x+21 equation:


Simplifying
y + -1x = -9x + 21

Reorder the terms:
-1x + y = -9x + 21

Reorder the terms:
-1x + y = 21 + -9x

Solving
-1x + y = 21 + -9x

Solving for variable 'x'.

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

Add '9x' to each side of the equation.
-1x + 9x + y = 21 + -9x + 9x

Combine like terms: -1x + 9x = 8x
8x + y = 21 + -9x + 9x

Combine like terms: -9x + 9x = 0
8x + y = 21 + 0
8x + y = 21

Add '-1y' to each side of the equation.
8x + y + -1y = 21 + -1y

Combine like terms: y + -1y = 0
8x + 0 = 21 + -1y
8x = 21 + -1y

Divide each side by '8'.
x = 2.625 + -0.125y

Simplifying
x = 2.625 + -0.125y

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