Question

1. Direct variation

Answer 1

(1) y = 7x , (2) y = 11x , (3) y = 9x , (4) y = 28x

given y varies directly as x then y = kx ( k is the constant of variation )

(1) find k using the given conditions k = $\frac{y}{x}$ = $\frac{63}{9}$ = 7

equation is y = 7x

(2) k = $\frac{121}{11}$ = 11

equation is y = 11x

(3) k = $\frac{36}{4}$ = 9

equation is y = 9x

(4) k = $\frac{224}{8}$ = 28

equation is y = 28x