Question

Suppose that y varies directly with x. Write the equation that represents this relationship if x is -7 and yis - 42 ? Find the value of y when x is 6.​

Answer 1

36

Explanation:

if y varies directly as x;

y ∝ x

mathematically,

y = kx

k is the constant of proportionality;

if x = -7, y = -42

-42 = k x -7

k = 6

Now,

x = 6;

y = kx

y = 6x 6 = 36