Question

If x=21 then y=49. What is the value of x when y=56?

Answer 1

28

Explanation:

notice that when x=21 thats 3x7=21

then when y=49 thats 7x7

so when y=56 that's 8x7

notice there is a patter of 7 being used? there are probably a lot of other patterns that would also work.. but. if your class is working on multiplying by 7 , then this is probably the right pattern.

from the above pattern, then,

x=4x7 when y=56

x=28

Answer 2

24

Explanation:

set them up as a fraction.

21/49=x/56

cross multiply: 21*56=49x

1176=49x

divide both sides by 49

x=24