Find the vector equation for the line through the origin that intersects both of the lines ř =(4,-1,2) + t(1,-1,1),t e R and r = (9,9,-4) + (2,3,-1), u ER.

Arestaurant offers delivery for their pizzas. the total cost the customer pays is the price of the pizzas, plus a delivery fee. one customer pays $23 to have 2 pizzas delivered. another customer pays $59 for 6 pizzas. how many pizzas are delivered to a customer who pays $86?