The standard form of a line:
.
The point-slope form: 
We have the point (3, -1) and the slope m = -1. Substitute:

<em>add x to both sides</em>
<em>subtract 1 from both sides</em>

Answer:
r = 1
Step-by-step explanation:
slope = change in y / change in x, so:
change in y / change in x = 2/3
5 - r / 7 - 1 = 2/3
5 - r / 6 = 2/3

now solve this equation.
first, multiply both sides by 6 to get rid of the fraction:

subtract 5 from both sides

multiply both sides by -1

5/7= -----------
0.714285
Convert the fraction to a decimal by dividing the numerator by the denominator.
6/10= 0.6
Convert the fraction to a decimal by dividing the numerator by the denominator.
16/20= 0.8
Convert the fraction to a decimal by dividing the numerator by the denominator.
9/10= 0.9
Convert the fraction to a decimal by dividing the numerator by the denominator.
Answer
the correct answer should be 109
Step-by-step explanation: