Question

solve with a matrix equation :
4x-3y=15
2x+y=5

Answer 1

so, can you set up the matrix of coefficients?

Answer 2

[4 -3]
[2 1]

Answer 3

[4 -3][x]= [15]
[2 1] [y] [5]

Answer 4

please solve the second equation for y

Answer 5

y=5-..., please complete

Answer 6

y=5-2x

Answer 7

ok!, now insert your y-value into the first equation

Answer 8

@Michele_Laino but the question is about "solve with a matrix"

Answer 9

4x-3(5-2x)=15

Answer 10

x=3

Answer 11

@Loser66 you are right!

Answer 12

sorry, was at another spot, so the first thing you gave me: was nearly correct "[4 -3]
[2 1] "

Answer 13

you just left out the right side of the eq :)

Answer 14

can you try to rewrite it now?

Answer 15

@adjsr1234 that's right!, now insert x=3, into your y-value

Answer 16

in order to solve your system using matrices, please note taht your system is:

Answer 17

My answer choices are not in matrix form so I figured out the answer. I got : (3, -1)

Answer 18

but you should learn how to do the problem