Question

Suppose y varies directly with X, and Y =22 when x = 8 what is the value of y when x= 10

Answer 1

Use K=y/x
   
K=22/x

K=22/8

then simplify

K=11/4

Answer 2

27.5

22= K(8)

Divide 8 on both sides to get your K value

2.75 = K

Plug your K value into the other equation

Y= 2.75(10)

Solve to get Y

Y= 27.5 When the problem asks "vary directly", it is saying that you are multiplying your K value with your X value(K*X). If the problem is asks "vary indirectly", it is saying that you are dividing your K value by your X value (K/X)