Question

A salesman weekly salary in calculated using function p(x)=0.09x+c, where x is that week’s revenue in dollars and c is a constant. Find c, if on the week when salesman sold goods on $1570 his salary was $490.30.

Answer 1

c = 349

Explanation:

Plug in 1,570 for x and 490.30 for p(x).

So:

490.30 = 0.09 (1,570) + c

Becomes:

c = 349

Answer 2

Step 1:

Put the information given in the word problem into the equation p(x)=0.09x+c. So plug in 1,570 for x and 490.30 for p(x).

490.30 = 0.09 (1,570) + c
490.30 = 141.3 +c
-141.3 -141.3
--------------------------------------
349 = c

Step 2: Check your work!

490.30 = 0.09 (1,570) + 349
490.30 = 141.3 + 349
490.30 = 490.30