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

Question

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

and i dont know how to work it with matrices

anonymous · Answer

on the calculator

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

ok i did and it comes out as 1 and 1.333333333333

anonymous · Answer

yep