Question

Find x if x + y = 5, and x - y = 7​

Answer 1

Answer:

x = 6

and

y = -1

Step-by-step explanation:

Given ,

$x + y = 5........(1)$

and

$x - y = 7........(2)$

Adding equation (1) and (2) we have

$x + y + x - y = 7 + 5 \\ \implies2x = 12 \\ \implies \: x = 6$

Again , from equation (1)

$6 + y = 5 \\ \implies \: y = 5 - 6 \\ \implies \: y = - 1$

Answer 2

Answer:

x + y = 5

 x - y = 7​  

-     +     -

_________-

0 +2y = -2

2y = -2

y = -2/2 = -1

now putting the value of y in any equation we get,

x + (-1) = 5

x-1= 5

x= 5+1

x = 6

Step-by-step explanation: