4x-7y=10 over 3x 2y=-7

Ana305 · Apr 5, 2011, 03:47 PM

smoothy · Apr 5, 2011, 06:16 PM

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Unknown008 · Apr 6, 2011, 08:08 AM

Do you really mean to divide one equation by another equation? :confused:

Communist · Apr 7, 2011, 12:43 AM

Did you mean two separate equations?

$2y=-7$

$\frac{4x-7y}{3x}=10$

In which case:

$2y=-7$

$y=\frac{-7}{2}$

$y=-3.5$

Then substitute in:

$\frac{4x-7(-3.5)}{3x}=10$

$4x-7(-3.5)=3x(10)$

$4x+24.5=30x$

$26x=24.5$

$x=\frac{24.5}{26}$

Unknown008 · Apr 7, 2011, 11:02 AM

Oh, I get it now, it's:

$4x - 7= \frac{10}{3x}$

$2y = -7$

Take the second equation and solve for y.

Then, take the first equation, put the value of y that you got to get the value of x.

Add your answer here.