Answer:
x = 4.1 & x = −4.1
Step-by-step explanation:

x = ±√17
x = √17, −√17
x = 4.1 & x = −4.1
Price before membership= price 1 = $6
price after membership = price 2 = $4
Membership price = $100
SO according to price 1 and price 2; price after membership saves up $2 for each session.
Hence to justify the price of membership number of sessions can be calculated as follows:-
$2 saved = 1 session
to make it $100 multiply both sides by 50
2×50 = 1×50
100$ saved = 50 sessions
so 50 sessions ate required to justify buying the membership.
Hope this helped :)
Answer:

Step-by-step explanation:
Given:
The equations given are:

Now, a linear function is of the form:

Where, 'm' and 'b' are real numbers and 
Equation 1: 
Simplifying using distributive property, we get:

The above equation is of the form
. So, it represents a linear function.
Equation 2: 
Here, both sides of the equation has same variable 'X'. So, it will form an equation of 1 variable. So, it's not a linear function.
Equation 3: 
Simplifying the above equation. This gives,

This is not of the form of the linear function. So, it is also not a linear function.
Equation 4: 
Simplifying the above equation. This gives,

This is not of the form of the linear function. So, it is also not a linear function.