Answer:
A value for x.
Step-by-step explanation:
For example,

Substitute a random number for x to find the value of y, after which you'll have a point.
Part 1
Let:
y be the total cost
x be the number of tickets
a be fair admission
Since the fair charges $1.25 per ticket, the equation of the line would look like:
y = 1.25x + a
Since Johnny spent $43.75 and bought 25 tickets, we find a by replacing y with 43.75 and x with 25:
43.75 = 1.25×25 + a
Now solve for a
43.75 = 31.25 + a
43.75 - 31.25 = a
a = 12.50
Going back to the first equation:
y = 1.25x + 12.50
Part 2:
a) Let (9,8) be (x1,y1) and (4,-12) be (x2,y2)
The formula for slope is:

b) For the point-slope equation, I'll use (9,8)
Using the formula:

c) For the slope-intercept form, we solve for y in the point-slope formula:
Are you asking for the letter or what the line is called because if it's just the letter then it is r if it is the name then its a plane intersect.
Answer:g(x)=-4^2+4x-5
Step-by-step explanation:
(9,-4) you have to plugin 9 to the equation in the form of x. Then you add 5 and that would be your y value