Question

Im still confused on how I find the solution to the system of equations with this problem...
what about use a matrix to find the solution to te system of equations?
-8x-9y=-16
6x-9y=-108

(-6,8)
(6,8)
(8,-6)
(6,-8

Answer 1

You do not need to use matrices

Answer 2

i dont know the answer, or how to do it?

Answer 3

-8x-9y=-16
6x-9y=-108
Subtract the second from the first to get
-14x =-16+108
-14 x =92
x=-46/7

Answer 4

Replace in one of equations and get
y=160/21

Answer 5

All your choices are not correct or the equations are not
typed correctly

Answer 6

use matrix to find the solution to the system of equations?

-8x-8y=-16
6x-9y=-108

Answer 7

sorry i typed it wrong earlier

Answer 8

theres a matrix called A and is equal to
(-8 -8)
(6 -9)

then you have B which is
(-16)
(-108)

Answer 9

first you find the determinant of the matrix A which is (-8)*(-9) - (-8)*6 and we'll call it detA

Answer 10

now to find x you need to replace the first column of A with the column-matrix B and also calculate its determinant (the product of the main diagonal minus the product of the secondary diagonal)

Answer 11

after youve done this, you simply do (the last determinant)/detA
and you do the same for Y, only replacing the second column of A with the column-matrix B

Answer 12

thats all. It's called the Cramer rule

Answer 13

so whats the answer? (6,8)

Answer 14

thats left for you to do :)

Answer 15

not that hard really. simple multiplications