Question

the function f is defined by f(x)=150/x-z where z is a constant. find z if the value of f at x=1/5 is equal to 250

Answer 1

Answer:

x = -1 $\frac{1}{20}$

Step-by-step explanation:

f($\frac{1}{5}$) = 120, therefore we can create this equation:

120 = 150 ÷ ($\frac{1}{5}$ - z)

cross-multiply to get: 24 - 120z = 150

-120z = 126

z = -1 $\frac{3}{60}$

Answer 2

Answer:

z=500

Step-by-step explanation:

since we know that the whole equation is equal to 250, we can substitute values in.

250=150/1/5 -z

250=750-z

-500=-z

z=500