Suppose y varies directy as x if x = 15 when y = 12 find x when y = 21

26.25

Step-by-step explanation:

y=12

x=15

y=kx 12=k×15 k=12/15=4/5=0.8

21=0.8×x

21/0.8=26.25

answer: group b.

step-by-step explanation:

answer: it actually depends on which is the independent variable and which is the dependent variable. let us say we're looking at a linear equation. y=2x+3. we theoretically could switch the equation to be x=(y-3)/2 and it would be the same line. so either a causes b or it can be that b causes a. so technically the answer is false

step-by-step explanation: