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2 Answers

Ron,
An ordered pair is always (x,y) for a point on a graph. This is why you will want to plug in the fist number in the coordinate ( , ) for your X value and the second number in the coordinate ( , ) as your Y value. Using the solutions they gave you, calculate your answers to see if it is equal to 5.
 
Good luck!   
Hi Ron;
Welcome to Wyzant!!!
2x + y = 5
Let's try the first set of coordinates,  (2, –1)...
2(2)-1=5
4-1=5
3=5---------Does NOT work.
Second;  (1, 2)
2(1)+2=5
2+2=5
4=5------Does NOT work.
Let's try the third set of coordinates,  (3, –1)...
2(3)-1=5
6-1=5
5=5-------ANSWER!!!!
 

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