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Rewrite the equation so that y is a function of x, y + 9x=4

y + 9x=4 please rewrite so that y is a function of x and explain the work so I can do it on the rest of the problems.

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keep y only at left hand side. to do this you need to remove other terms.
here 9x is present with y. to remove it you need to subtract 9x. but you should subtract both sides
y + 9x - 9x = 4 - 9x
y = 4 - 9x
now y is the function of x.

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just get x by itself.

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