Question

Which pair of points are on the graph of y = −3x −11?
(2, 7) and (−1, 4)
(3, −20) and (−4, 1)
(6, 8) and (9, 3)
(4, −1) and (−5, −2)

Answer 1

find the slope of the line thru each pair

Answer 2

if slope is eql to slope of line they MAY lie on the line

Answer 3

and then plug in those pts to see if they satisfy the line eqn

Answer 4

i got tje second one..

Answer 5

You are correct. @him1618 is correct in how you can do it, but if you're going to be plugging in the points to the equation, you might as well just plug them in without finding the slopes. If either point of a choice doesn't work, then you can elliminate it as a possibility

For instance, with the first pair, (2,7) doesn't work so there's no reason to try (-1,4). Once you try the second pair, you see they both work and is therefore, you ra nswer.

This is a little faster than finding the slopes...although I like @him1618's method since it drives home more practice :)

Answer 6

thanks