You can put this solution on YOUR website! 8x - 4y= 16 ......(1)
y = 2x - 4 ......(2)
substituting the value y in equation (1)
8x - 4*(2x -4) = 16
8x - 8x -16 = 16
0=0
As the equation is true so these equation have infinitely many solutions as they coincide on each other.