Question

If x + y = 5 and  x - y = 1, then find the value of x.

Answer 1

x = 5 - y  -(i)

y = x - 1  -(ii)

Now put the value of eq(ii) into eq(i)

x = 5 - (x - 1)

x = 5 - x + 1

x = 6 - x

2x = 6

x = 3