Question

If 4x + y = 7 and x +4y = -2, then x-y = ___ *
​

Answer 1

Answer:

3

Step-by-step explanation:

4x+y=7

-4x-16y=8

therefore...

y=-1

x=2

therefore..

x-y=3

Answer 2

Step-by-step explanation:

1. 4x + y =7

4x=7-y

x= (7-y)/4 .........(equation1)

NOW PUTTING VALUE OF X IN THE 2ND EQUATION.

2.x+4y =-2

(7-y)/4 +4y = -2

(7-y) + 16y = -2

7+15y=-2

15y = -2 -7

15y = -9

y = -9/15

y= -3/5

NOW PUTTING VALUE OF Y IN EQUATION 1

X = (7-y)/4

x= (7-(-3/5))/4

x=1.9

therefore

x-y= 1.9 - (-3/5)

x-y = 2.5