"4. Suppose y varies directly with x. Write a direct variation equation that relates x and y. Then find the value of y when x= 12. y = -10 when x = 2 "
If y varies directly with x: y = k * x When x = 2, y = - 10. - 10 = k * 2 k = - 10 : 2 k = - 5 Therefore: y = - 5 x And when x = 12 ; y = - 5 * 12 Answer: y = - 60
