Solve the system of equation by graphing.

Question

x-y=4

x+y=12

 

A).The solution is ___. ( Type an order pair.)

B). There are many solutions

C) No solution

Answer 1

answer is A.

 

use elimination to find x and y

 

x-y=4
x+y=12

-----------------

2x   = 16

 

x = 8

 

plug the x = 8 to one of the equation and then solve for y

 

x + y = 12

 

8 + y = 12

 

y = 4

 

ordered pair is (8,4)