The value of x in terms of p is
.
The value of x when p is −5 is
.

From question, we have, 4 (px + 1) = 64. The value of x in terms of p is 15/p. The value of x when p is -5 is -3.
You can simply replace those variables with the value you know of them and then operate on those values to get a final value.
This is the result of that expression at those values of the considered variables.
From question, we have,
4 (px + 1) = 64
4px + 4 = 64
4px = 60
x = 60/4p
x = 15/p
The value of x in terms of p is 15/p.
The value of x when p is -5
= 15/-5
= -3
Learn more about evaluating a function at a value here:
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