Substitution method for 7x-2y=1 & x-2y=1

We want to use the Substitution method to solve

7x - 2y = 1 (1)

x - 2y = 1 (2)

From equation (1), obtain

2y = 7x - 1 (3)

Substitute (3) into (2).

x - (7x - 1) = 1

-6x + 1 = 1

-6x = 0

x = 0

From (3), obtain

2y = 7*0 - 1 = - 1

y = - 1/2

Answer: (0, - 1/2) or x=0, y = - 1/2.