We've even drawn it a few times. 91 minus 27 is 64. 64 times negative 1⁴ is equal to negative 16. So this is negative 16 right over here. So just like that, we have the equation for the line tangent to the graph of h at t is equal to zero. I'll write it one more time. It is, we've got a mini drum roll here, y is equal to negative 16t plus 91.