So if we say-- let me pick a new, vibrant color, a yellow-- if we make x equal to 0, then the left hand side of this, this is 0,0, we just left with-- we're just left with 20, is equal to a, which is just 7, times 0 plus 0 plus 4, 7 times 4, plus-- bx plus c, the bx just disappears because b times 0 is 0, plus c times 0 minus 2, c times minus 2-- scroll down a