Question

which equation represents the line passing through the points (3,2) and (-9,6)

A. x-3y=9
B. x+3y=9
C. 3x-y=-9
D. 3x+y=9

Answer 1

which one do you think?

Answer 2

A

Answer 3

it's not A because the line has (3,-2) not (3,2)

Answer 4

but it has (-9,-6) not (-9,6)

Answer 5

so i have to replace the point into the equation

Answer 6

yes and see which one is true

Answer 7

let's see B

Answer 8

we will use the ordered pair (3,2)
x = 3
y = 2

Answer 9

so in the equation
x+3y=9
substitute the values
3 + 3(2) = 9
3 + 3*2 = 9
is that true?

Answer 10

yes

Answer 11

ok now let's try the second ordered pair
(-9,6)
x+3y=9
-9 + 3(6) = 9
-9 + 3 * 6 = 9
true?

Answer 12

yes

Answer 13

so that is the equation for the line!

Answer 14

thanks alot

Answer 15

yw ^_^