Question 96224
x+y=1  and x^2-y=0
.
x+y=1 because it passes the "vertical line test"
{{{ graph( 300, 200, -6, 5, -10, 10, -x+1) }}} 
.
and 
x^2-y=0 because it also passes the "vertical line test"
{{{ graph( 300, 200, -6, 5, -10, 10, -x^2) }}}