Question

1. Choose the value of the x determinant (Dx) in the system.
3x - 7y = 11
2x + 5y = -4

1
27
29
83
@jim_thompson5910

Answer 1

how far did you get with this?

Answer 2

well so forgot the formula/rule if you could remind me that would be great

Answer 3

are you able to form the matrix using the coefficients on the left side?

Answer 4

i think so..

Answer 5

go ahead and draw out the matrix

Answer 6

actually no I'm stuck @jim_thompson5910

Answer 7

you should get this 2x2 matrix

Answer 8

see how those numbers are the coefficients?

Answer 9

oh ok. don't I have to cross multiply or something

Answer 10

then we replace the first column



with the numbers found on the right side of each equation