The slope of the line is 2
or
m=2
The formula for slope is: (y2-y1) / (x2-x1)
So,
(12-4) / (5-1)
8 / 4
Which reduces down to 2
Slope is the change in y over the change in x:
Slope = (y2 - y1) / (x2-x1)
Replace the letters in the equation with the given information:
1/2 = (1 - -1) / (15 -r)
Cross multiply:
1 * (15-r) = 2 * (1- -1)
Simplify:
15 -r = 4
Subtract 15 from each side:
-r = -11
Because r is negative, you need to multiply both sides by -1 to make r positive:
r = 11
Answer:
196.9 million mi^2
Step-by-step explanation:
