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)


*There can be more than one ordered pair. Just double checking my answers.

Answer 1

Basically you're setting
x = -1, x = 0, x = 1, and x = 2
and seeing if you get
y = 11, y= 8, y = 7 and y = 5 as the result

Example:

y = -2x + 9 "the y coordinate is found by taking negative two times the x coordinate and then adding nine to that."

let x = -1
y = -2*(-1) + 9 ==> -2 times -1 is +2
y = 2 + 9 add 2 and 9
y = 11

So the ordered pair is (-1, 11)
This ordered pair matches the pair in the "replacement set". :)

Answer 2

Thank You(: What You wrote made a lot of sense.

Answer 3

Yay! :) Also, I like how you do the smileys backwards. q-;

Answer 4

Haha and I like your smiley (: lol