Mathematics
13 Online
OpenStudy (anonymous):
.
Join the QuestionCove community and study together with friends!
Sign Up
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.
Join the QuestionCove community and study together with friends!
Sign Up
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
Join the QuestionCove community and study together with friends!
Sign Up
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?
Join the QuestionCove community and study together with friends!
Sign Up
OpenStudy (anonymous):
You didn't really explain. You just posted how to solve
OpenStudy (confluxepic):
Oh. Ok.