"The branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids, and higher dimensional analogs." - Dictonary.com
In simple words, it is a study in math in which you study shapes, lines, planes, and points.
X=20*8.15/6.25 this will give you your answer
Answer:26
Hope this helps!
Rearrange the equation to get:
y = 3x - 7
From this you can see that:
m = 3, b = -7
The fromula of a slope:

a) (-1, -8), (-7, -4)
substitute

b) (2.1, 3.8), (3.1, 7.6)
substitute

If your solvung for x the answer will be X= 6y