How do you graph the function y=-x+9?

Jul 30, 2017

See a solution process below:

Explanation:

Substitute some points for $x$ to obtain corresponding values for $y$. Such as:

$x = - 10$ Then $y = - - 10 + 9 = 10 + 9 = 19$ gives: $\left(- 10 , 19\right)$

$x = - 5$ Then $y = - - 5 + 9 = 5 + 9 = 14$ gives: $\left(- 5 , 14\right)$

$x = 0$ Then $y = - 0 + 9 = 9$ gives: $\left(0 , 9\right)$

$x = 5$ Then $y = - 5 + 9 = 4$ gives: $\left(5 , 4\right)$

$x = 10$ Then $y = - 10 + 9 = - 1$ gives: $\left(10 , - 1\right)$

Now, plot the points and draw a line through the points:

graph{(y+x- 9)((x+10)^2+(y-19)^2-1)((x+5)^2+(y-14)^2-1)((x+0)^2+(y-9)^2-1)((x-5)^2+(y-4)^2-1)((x-10)^2+(y+1)^2-1)=0 [-40, 40, -20, 20]}