Answer:
value of constant a is (-5).
Step-by-step explanation:
The function f is defined by f(x) = a - 2x
where a is a constant.
We have to find the value of a if the graph passes through (8, - 21)
If function passes through ( 8, -21 ) then x and y value of this point will satisfy the equation.
y = f(x) = a -2x
-21 = a -2(8)
-21 = a - 16
a = -21 + 16
= -5
Therefore, value of constant a is (-5).
