Given a function: y = 105x − 10. What should the argument x be if the value of the function y is 5.

The argument value is the x value, and the function value is the y value. That is, knowing the value of y, you need to find x.

y = 5, substitute it into the function and find x.

y = 105x − 10

5 = 105x – 10

Let’s flip the equation for convenience of calculations:

105x – 10 = 5

105x = 5 + 10

105x = 15

x = 15/105 = 1/7

Answer: x = 1/7