3x = 21, then x = ? please help i dont really understand and te answer choices are 7, 18, 6

7

Step-by-step explanation:

Because 3x7=21.

if 3x = 21 all you have to do is divide both sides of the equation by 3

3x = 21

3x divided by 3 is x, and 21 divided by 3 is 7

so then you get x = 7

what are the statements

step-by-step explanation:

(d)

step-by-step explanation:

given: the line in the graph passes through points (5,30) and (6,26).

then, the equation of line is:

now, put y=a(n) and x=n,

hence, option d is correct.