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Mathematics 13 Online
OpenStudy (anonymous):

.

OpenStudy (confluxepic):

\[\huge \color{blue}{Welcome~To~Open~Study}\]

OpenStudy (confluxepic):

Do you understand how to multiply the equations to get one variable similar.

OpenStudy (anonymous):

I have to add the equations together first right?

OpenStudy (confluxepic):

No.

OpenStudy (confluxepic):

Multiply each equation by something to get one variable the same.

OpenStudy (jdoe0001):

\(\large { \begin{array}{llll} 3x + 4y = 1&{\color{brown}{ \times 3}}\to &9x\cancel{ +12y }=3\\ 5x - 3y = 21 &{\color{brown}{ \times 4}}\to &20x\cancel{ -12y }=84 \\\hline\\ &&\square ?+\square ?=\square ? \end{array} }\)

OpenStudy (confluxepic):

Add the equations. 29x=87

OpenStudy (confluxepic):

Divide by 29. x=3

OpenStudy (confluxepic):

Plug x into one of the equations and solve for y. 9+4y=1

OpenStudy (confluxepic):

Subtract 9 on both sides. 4y=-8

OpenStudy (confluxepic):

Divide by 4 on both sides. y=-2

OpenStudy (confluxepic):

x=3 y=-2

OpenStudy (confluxepic):

Those are your solutions. @algebrastudent23

OpenStudy (anonymous):

I need it explained. Reposting

OpenStudy (confluxepic):

I did explain it. What part did I miss?

OpenStudy (anonymous):

You didn't really explain. You just posted how to solve

OpenStudy (confluxepic):

Oh. Ok.

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