solve the simultaneous equation

Question

2x+2y=7
x^2-4y^2=8

Answer 1

x^2-4y=8.............(1)
2x+2y=7
or 2x=7-2y
or x=7-2y/2......(2)

from 1&2
(7-2y)^2-4y=8
or 49-28y+4y^2-4y=8
or 4y^2-32y=41
4y(y-32)=41
either 4y=41....(a)
or y-32=41.....(b)
from a
y=41/4=10.25
from b
y=73

so, y=10.25 or 73