What is the value of x?

x + 2
15
=
x + 1
5
a) x =
1
2
b) x = 10
c) x = -
1
2
d) x = -10

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.

answer: c

because if you look at the chart you can see a pattern and compare it to the question he simplify out your

but i think the formula is f(x)=6x