Question

solution of simultaneous equation x+y=21,x-y=7​

Answer 1

Answer:

x = 14 , y = 7

Step-by-step explanation:

using elimination method

x + y = 21 --------- equation (1)

x - y = 7 ---------- equation (2)

________

2x = 28

x = 14

putting value of x in equation (1)

x + y = 21

14 + y = 21

y = 21 - 14

y = 7

y = 7