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Activity 1
A. In each of the following, y varies directly as x. Find the values as indicated. Use the back of the paper
for your solution.
1. Ify = 18 when x = 9, find y when x = 7.
2. Ify = 28 when x = 7, find x when y = 64
3. Ify = -42 when x = -6, find y when x = 10​

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Answer:

1. y= 14

2. x= 16

3. y= 70

Step-by-step explanation:

Formula/ Equation, y= kx

Find all constant, k on every problem

1. 18=k(9)

k=18/2= 2

When x=7

y =2(7)

y=14

2. 28=k(7)

k=28/7= 4

When y=64

64 =4(x)

x=16

1. -42=k(-6)

k=(-42/-6)= 7

When x=10

y = 7(10)

y=70

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