Question

express y in terms of x . 2y- 4x =7. check whether (1,-1) is a solution

Answer 1

2y-4x=7
2y=7+4x
y=(7+4x)/2
Point (1,-1)does is not the solution because
LHS=Y=-1
RHS=(7+4X)/2=11/2=5.5≠LHS