What is the equation of the horizontal line graphed below?

x = –4

y = –4x

y = x – 4

y = –4

What values of c and d make the equation true?

Giuseppi's pizza had orders for $931.00 of pizzas. the prices were $21 for a large pizza, 514 for a medium pizza, and $7 for a small pizza. the number of large pizzas was two less than four times the number of medium pizzas. thenumber of small pizzas was three more than three times the number of medium pizzas. how many of each size of pizza were ordered?

How do i do this activity, is appreciated