Question

Find the value of X and Y: X+Y=4 , -X+Y=10 ​

Answer 1

Step-by-step explanation:

• x+y=4
• -x+y=10
• by elimination

Therefore 2y=14

hence y=7

and x= -3

Answer 2

Step-by-step explanation:

let ,

x+y=4 .........(1)

-x+y=10.........(2)

using equation(1) we get

x+y=4

x=4-y

substituting the value of x in equation (2) we get

-x+y=10

=> -(4-y)+y=10

=> -4+y+y=10

=> -4+2y=10

=> 2y=10+4

=> 2y=14

=> y=14/2

=> y=7

now putting the value of y in equation (1) we get

x+y=4

x+7=4

x=4-7

x= -3

therefore x=-3 and y= 7