X is partly constant and partly varies directly with y. When x=9,y=5 and when x=34,y=10.

Question

a. What is the formula connecting x and y
b. Find the value of x when y=7

Answer 1

X is partly constant and partly varies directly with y
----> x = ky + c
when x = 9, y = 5
9 = 5k + c
when x = 34 , y = 10
34 = 10k + c

subtruct them:
25 = 5k
k = 5
in 9 = 5k + c
9 = 25 + c
c = -16

x = 5y - 16

Answer 2

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Answer 3

Felicity Runn