X is partly constant and partly varies as y . when y =2,x=15 and y =4, x=27 (a) find the formula which connects x and y (b) find x when y=7

Answer 1

looks like your standard:
x = my + b

case1: y = 2 when x = 15
15 = 2m + b **
case2: y = 4 when x = 27
27 = 4m + b ***

subtract ** from ***
12 = 2m
m=6
from ** 15 = 12+b ---> b=3

x = 6y + 3

when y = 7
x = 42+3 = 45

Answer 2

Your question is some how confusing explain in better tone

Answer 3

Fine the relationship between x&y

Answer 4

D is partly constant and partly varies with v, where v=40,
d=192. Find the formula connecting d and v, Calculate d when v=73.

Answer 5

If a is partly constant and partly varies with b when a =15 b=2 and when a=27 b=5 a) find the equation for this expression b)find the values of the two constant

Answer 6

I your cooperation