No. To test whether a graph is a function or not you do the vertical line test where if a vertical line touches more than one point it is not a function
Answer: 10
<u>Step-by-step explanation:</u>
varies directly means: 
Step 1: solve for k ⇒ 
Step 2: plug in the given value and k to solve for the missing value: 
42(5) = 21(x)

2(5) = x
10 = x
Hello.
-8.46 is less than 5.31, because it is negative.
C. Got you man.
Lemme know if I’m right