Solve the following system by graphing.
x - y = 4
x + y = 2
what is the solution of the system?
a. (3, -1)
b. (3, 1)
c. (-1, 3)
you do not have to include the graph, but it would be appreciated.

Show me how you find y and z and determine what y and z are you i appreciate it : )

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?

Shane can shovel the driveway in 4 hours, but if his sister it would take 2 hours. how long would it take taylor to shovel the driveway alone