Suppose y varies as x and y = 21 when x = 8 find y when x = 16

y = 42

Step-by-step explanation:

given y varies as x then

y = kx ← k is the constant of variation

to find k use the given condition y = 21 when x = 8

k = = , hence

y =

when x = 8 then y = = 42

a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

step-by-step explanation: