Question

Which system of equations has only one solution?

A) 4x + 2y =8
-4x - 2y =3

B) -5X + Y =6
5X - Y = - 6

C) -3X + 4Y = 2
3X - 4Y =0

D) 2X + 4Y = 6
3X - 4Y =9

Answer 1

The answer is D

Explanation:

Here is proof:

Answer 2

D) 2X + 4Y = 6

3X - 4Y =9

Explanation:

Adding the equations can be informative. The sums are ...

A) 0 = 11 . . . . . no solution

B) 0 = 0 . . . . . infinite solutions

C) 0 = 2 . . . . . no solution

D) 5X = 15 . . . one solution (x, y) = (3, 0)