Question

Solve by substitution : y – 3x = 5 y + x = 3

Answer 1

y – 3x = 5....(i)
y + x = 3......(ii)
from (i)
y=5+3x
substitute this in (ii)
5+3x+x = 3
5+4x = 3
4x = 3-5
4x =-2
x =?
y=?

Answer 2

once you find x, sub that back into (i) or (ii) to find y