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)} check all that apply.
a.(-1,11)
b. (0,8)
c.(1,7)
d.(2,5)

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)