[input]plot( x-5, 2x+1, x=-10..5 )[/input]
[input]plot(-3x+7, 3x+4, x=0..0.75 )[/input]
[input]plot(6-x, -(-11-2x)/8, x=0..5 )[/input]
[input]solve( y=x-5, y=2x+1 )[/input]
[input]solve( y=-3x+7, y=3x+4 )[/input]
[input]solve( x + y = 6, 2x - 8y = -11 )[/input]
