Question

find the point of intersection of the lines 2x-3y=-2 and 9x+12y=25

Answer 1

I know you use matrices but what do you do after you plug it in the calculator

Answer 2

you don't have to explicitly use matrices you can solve by substitution or elimination...

Answer 3

think about multiplying the first equation by 4 and then adding it to the second equation... see what you get

Answer 4

yeah i know those but my teacher wants matrices haha, the answer would x= -59 and y = 47

Answer 5

and i dont know how to work it with matrices

Answer 6

on the calculator

Answer 7

\[\left[\begin{matrix}2 & -3 \\ 9 & 12\end{matrix}\right] \]

Answer 8

use the calculator to find the inverse, multiply it by
\[\left(\begin{matrix}-2 \\ 25\end{matrix}\right)\]

Answer 9

ok i did and it comes out as 1 and 1.333333333333

Answer 10

yep