Question

helppp 2.0

7x - 3y = 4
2x - 4y = 1

Which of the following system of equations is not equal to the system of equations shown above?

28x - 12y = 16 and -6x + 12y = -3
14x - 6y = 4 and -14x + 28y = 1
-28x + 12y = -16 and 28x - 56y = 14

Answer 1

Answer:

7x-3y=4 .....(1)

2x-4y=1 ......(2)

((1)×4 - (2)×3)

28x-12y=16

6x-12y=3

_________

22x=13

x=13_22

13_22-3y=4

3y=4×22_13

3y=88_13

y=88_13×3

=88_39