# Math Help - given that f is a linear function , f (4)=-5 and f (0)=3, write the equation that def

1. ## given that f is a linear function , f (4)=-5 and f (0)=3, write the equation that def

given that f is a linear function , f (4)=-5 and f (0)=3, write the equation that defines f

i can find the averate rate of change and is -2but i cannot find the y int...

2. Originally Posted by alessandromangione
given that f is a linear function , f (4)=-5 and f(0)=3, write the equation that defines f

i can find the averate rate of change and is -2but i cannot find the y int...
you have the y-intercept

3. Any linear function can be written as f(x)= mx+ b. Knowing that f(4)= -5 tells you that 4m+ b= -5 and knowing that f(0)= 3 tells you that 0(m)+ b= 3. Solve those two equations for m and b.