X=2y+7

x=y+4

with substitution

x = 2y + 7 (*)

x = y + 4 (**)

Substitute (*) to (**):

2y + 7 = y + 4 subtract 7 from both sides

2y = y - 3 subtract y from both sides

y = - 3

Put the value of y to the second equation:

x = - 3 + 4

x = 1

Answer: x = 1 and y = - 3 → (1, 3)