Question

What is the value of Dx in the following system?

x + 3y = –3
2x + 5y = –7

A. -36

B. -1

C.-13

D.6

Answer 1

@johnweldon1993 can you help?

Answer 2

The value of "Dx"? Are you sure you don't mean just 'x' ?

Answer 3

D sub X

Answer 4

Sorry just reviewing discriminants... hang on :)

Answer 5

Okay..that's right too...to find the discriminant of a system of linear equations

x + 3y = –3
2x + 5y = –7

Dx= (-3 * 5) - (3 * -7)
Dx = -15 - (-21)
Dx = -15 + 21
Dx = 6

Let me think about how to explain it though ...:)

Answer 6

Okay I understand! thanks for making it easy to follow. :)