Question

Y varies jointly as x and z. y = 75 when x = 5 and z = 5. Find y when x = 4 and z=6. y =​

Answer 1

y = 72

Explanation:

Joint proportion is given by the expression;

y = kxz

Given the following values;

y = 75, x = 5 and z = 5

To find the constant, k;

75 = k*5*5

75 = 25k

k = 75/25

k = 3

Next, we find the value of y when x = 4 and z= 6

y = kxz

y = 3*4*6

y = 72