Question

Choose the value of the y determinant (Dy) in the following system.
2x + 4y = 5
3x – y = 7

Answer 1

the options are
A. –14

B. –33

C. –1

D. 6

Answer 2

What is the equation for the determinant?

Answer 3

isn't it with cramer's rule?

Answer 4

i don't know how to plug it in

Answer 5

Well this is going to be your matrix:
2 4 |5
3 -1 |7

Answer 6

so you just write the value of A,B and C?

Answer 7

now you substitute the y column right?
2 5
3 7

Answer 8

Give me a moment..

Answer 9

http://openstudy.com/study#/updates/4f3fbbd5e4b0534c53cbd487

Answer 10

thank you!! i'll check it out

Answer 11

It's pretty much the same thing, only different numbers.

Answer 12

so it's -1?

Answer 13

2 5
3 7
2*7 - 5*3 = 14-15=-1
yup

Answer 14

thanks!!