The variables xx and yy vary directly. use the values to find the constant of proportionality, kk. then write an equation that relates xx and yy. write any fractions in simplest form. y=45; x=40

Direct variation means that changes in x will result to changes in y. If x increase, y also increases and vice versa.

y = kx

k = y / x

y = 45; x = 40

k = 45/40

k = 1.125

y = 1.125x

y will increase by 1.125 interval of x.