We can observe that the function describing the graph is linear and so the equation is of linear nature:

Numbers m and n have special names. m is called the slope, n is called y-intercept.
From the graph one can tell that the line intercepts y-axis at y = -1 that means n = -1. What about the slope you say?
The slope can be calculated using two points' coordinates that lie on the line:

Now our line has an equation,

Hope this helps.
Answer:
y=5x+4
Step-by-step explanation:
y=mx+b
m=slope
x=constant
b=y intercept
I=$52,000
R=6.75%
T=5.5 years
P=$19,305
Let
x--------> the amount you have left to spend
y--------> the cost of a shirt you want
z------> the amount of the gift card
we know that
--------> equation 
--------> equation 
--------> equation 
Substitute the equation
and equation
[/tex]

therefore
<u>the answer is the option</u>
x+15 is less than or equal to 60