lunitaboo
I cant seem to find the answer to this can anyone help me?
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lunitaboo
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jdoe0001
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well, do you know how to do system of equations?
lunitaboo
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yeahbut i cant seem to find the answer i get (4,6) -.- ? @jdoe0001
jdoe0001
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$$
\begin{matrix}
5x &+7y & =32 \\
8x & +6y & =46 \\
\hline
\end{matrix}
\text{multiply the 2nd by -1}\\
\begin{matrix}
5x &+7y & =32 \\
8x & +6y & =46 & \times -1 \\
\hline\\
? & ? & ?
\end{matrix}
$$
Luigi0210
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matrix seemed easier
drotzmann
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its the last one... use cramers rules
drotzmann
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(5,1)
jdoe0001
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matrix? w000t?
jdoe0001
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hmmm
jdoe0001
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hold on
jdoe0001
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-1 will not the trick
lunitaboo
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thanks @drotzmann
amistre64
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id suggest just testing out the options to see what fits ....
drotzmann
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No problem, i do suggest using youtube to learn how to do Cramer's Rule
lunitaboo
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omg i had totaly forgor that system @amistre64
lunitaboo
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youtubes super helpful too i also forgot about that too ._. @drotzmann
drotzmann
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haha:)
jdoe0001
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well, to cancel out the "y" I'd just do
6 * n = 7
n = 7/6
thus 6 * 7/6 = 7
that gives you a 7y at the bottom, thus cancelling out "y"
amistre64
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in kindergarten, i was confronted by a hole shaped like a triangle, and 4 blocks oddly shaped blocks. instead of measuring stuff and trying to work out some complicated things ... i just picked up each block till i found the one that fit :)
jdoe0001
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$$
\begin{matrix}
5x &+7y & =32 \\
8x & +6y & =46 \\
\hline
\end{matrix}\\
\text{multiply the 2nd by -7/6}\\
\begin{matrix}
5x &+7y & =32 \\
-\frac{28}{3}x & -7y & =-\frac{161}{3} & \times \color{blue}{-\frac{7}{6}} \\
\hline\\
? & 0 & ?
\end{matrix}
$$
drotzmann
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@jdoe0001 ....one of us is on crack... i have no idea what you are doing. Cramer's Rule is so much more easier
jdoe0001
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hehhe, yes, because is a 2x2, well, yeah, I gather you'd use that :)
drotzmann
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three 2x2's to be correct ;)
jdoe0001
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hehe, yes, not sure ... if it'd be .... I guess it depends
I mean, off you have to get the discriminant, then 2 more discriminants
jdoe0001
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determinants rather
drotzmann
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yup:) exactly