Question

Write a linear function f with the values f(-9) = 8 and f(-9) = 8 and f(0) = 1

Answer 1

$\begin{gathered} x_1=-9,y_1=8,x_2=0,y_2=1 \\ y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1) \\ y-8=\frac{1-8}{0+9}(x+9) \\ y-8=-\frac{7}{9}(x+9) \\ 9y-72=-7x-63 \\ 9y=-7x+9 \\ y=-\frac{7}{9}x+1 \end{gathered}$