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DribleDaVaca19 Group Title Which matrix equation can be used to solve the system? Will draw it. one year ago one year ago

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1. DribleDaVaca19 Group Title

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2. amistre64 Group Title

Ax = b x = A^(-1) b might be one of the options

3. amistre64 Group Title

they was nice enough to give you a determinant of 1 ... how sweet

4. DribleDaVaca19 Group Title

i have 4 answers

5. amistre64 Group Title

the answers might help us determine a suitable soluton process

6. DribleDaVaca19 Group Title

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7. amistre64 Group Title

ax + by = n cx + cy = m matrix A = a b c d vector b = n m so yeah, they are looking for an inverse setup

8. DribleDaVaca19 Group Title

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9. amistre64 Group Title

do you recall how to find the inverse of a 2x2 matrix?

10. amistre64 Group Title

the shorcut involves a swap and some negations, youll also need a determinant

11. DribleDaVaca19 Group Title

never mind I found it out, thx anyways

12. amistre64 Group Title

$\begin{pmatrix}a&b\\c&d\end{pmatrix}^{-1}=\begin{pmatrix}d/|A|&-b/|A|\\-c/|A|&a/|A|\end{pmatrix}$