Yand x have a proportional relationship, and y = 15 when x = 3. what is the value of x when y = 4? enter your answer in the box. y and x have a proportional relationship, and y = 12 when x = 5. what is the value of y when x = 8? enter your answer in the box

The value of x when y = 4 is 4/5

The value of y when x is 8 is 7.5

If y and x have a proportional relationship and y = 15 when x = 3, hence;

y =  kx

k = k/x

k = 15/3

k = 5

If y = 4, the value of x is calculated as:

x = y/k

x = 4/5

Hence the value of x is 4/5

Similarly, if y and x have a proportional relationship, and y = 12 when x = 5, hence;

y = k/x

k = yx

k = 12 * 5

k = 60

The value of y when x is 8 is expressed as:

y = 60/8

y = 7.5

Hence the value of y when x is 8 is 7.5

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