7x-2y=39 And 5x=21-2y

Question

 Find the ordered pairs (x,y)  what satisfies each system 

Answer 1

Hy Tanya,

 

7x - 2y = 39

 

5x + 2y = 21

 

 

Add both the equations together 

 

 

12x = 60

 

x = 5

 

substitute this value for x into equation 1

 

35 - 2y = 39

 

-2y = 4

 

y = -2

 

 

The ordered pair (5,-2) satisfies each system.