9x9+81
81/7= 81 over 7, or 11.6
The standard form equation of the line connecting the two points is 
Linear equation in a standard form is given as 
where,
A, B, and C are constants or numbers
x and y are the variables.
To solve this problem, the following steps would be taken:
Step 1: Find the slope of the line connecting points (-3,4) and (2,-6)

where,

Substitute

Step 2: Find the y-intercept (b) of the line by substituting
and
into
(slope-intercept form)

Step 3: Write the equation of the line in slope-intercept form by substituting
and
into 

Step 4: Rewrite the equation in standard form 

Add
to both sides

The standard form equation of the points (-3,4) and (2,-6) is 
Learn more about standard form of two points of a linear equation here:
brainly.com/question/18446164
65.99(0.15)
Now take that number and subtract it from the original cost
65.99-9.9
56.09
It could be 17/24 but you may need to simplify