Which ordered pairs from the replacement set are solutions to the equation?
y = -2x + 9 ; Replacement Set {((-1, 11), (0, 8), (1, 7), (2, 5)}
A.(-1, 11)
B.(0, 8)
C.(1, 7)
D.(2, 5)

Question

Which ordered pairs from the replacement set are solutions to the equation?
y = -2x + 9 ; Replacement Set {((-1, 11), (0, 8), (1, 7), (2, 5)}
A.(-1, 11)
B.(0, 8)		
C.(1, 7)
D.(2, 5)

mathmate · Answer

I only see one pair which is NOT a solution.

anonymous · Answer

can you explain please im confused about this problem in general :/

mathmate · Answer

The ordered pairs mean (x,y).  You feed x into the function and see if the y calculated by the function matches the y given in the ordered pair.  If there is a match, the ordered pair is a solution to the function.
For example:
y = -2x + 9 ; 
Let's check the ordered pair (-1,11).
x=-1, so substitute in the function, y=-2(-1)+9=2+9=11.
Since 11 matches the value of y given, (-1,11) is a solution to the function.
You can continue and reject the ones that do not match.