y=-4/9x

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Solution for y=-4/9x equation: 


x in (-oo:+oo)

y = (-4/9)*x // - (-4/9)*x

y-((-4/9)*x) = 0

(4/9)*x+y = 0

4/9*x+y = 0 // - y

4/9*x = -y // : 4/9

x = -y/4/9

x = -9/4*y

x = -9/4*y

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