Which picture best illustrates the following postulate? “The intersection of two planes is a line."
B
C
A
none of the choices

The correct answer is B

Explanation:

In mathematics and related areas, a plane is a surface. This implies if there are two planes intersected, there should be two surfaces that pass across each other. Also, this bidimensional. This feature only occurs in option B because this is the only one that shows the two planes and their intersection, while options A and C show only one plane. Moreover, the intersection of planes forms a defined lined, which is shown in the region, in which the two surfaces met. This implies option B shows the postulate.  

shift 4 units up, and 1 unit left.

it will translate f(x) = 3^x to g(x) = 3^(x+1) + 4