"X is partly constant and partly varies as y"
---> x = ky + p
when y=2,x=30 ---> 30 = 2k + p
when y=6,x=50 ---> 50 = 6k + p
subtract: 20 = 4k
k = 5
sub back in the first: 30 = 10+p
p = 20
x = 5y + 20
now you can answer B
notice this is just a variation of y = mx + b
Note that
Find the grearest common factor GCF(30,42). You can see that numbers 30 and 42 have common factors 2 and 3, then

This gives that the greatest number of identical vases florist can fill is 6. Each vase will contain
carnations;
roses.
Therefore, in each vase will be 12 flowers (5 carnations and 7 roses).
1st: do distributive property, that will give you 3x + 6 + 5x
2nd: combine like terms to simplify, this will give you 6 + 8x
8 x 8 = 64
Each ‘face’ is 64in^2
64 x 6 = 384
= 384in^2