Question

What is the equation of the line that passes through the points (−2, 1) and (1, 10)?
A: 3x-y=-7
B:3x-y=-5
C:3x-y=5
D:x+3y=-5

Answer 1

you know how to find the slope?

Answer 2

yes
m= y2-y1 / x2=x1

Answer 3

ok you need that first

Answer 4

i did that and i got 3

Answer 5

ok, next comes point slope formula

Answer 6

i thought it was letter A but its negative not positive

Answer 7

let's pick \((1,10)\) so we start with \[y-y_1=m(x-x_1)\] or \[y-10=3(x-1)\]

Answer 8

multiply out get \[y-10=3x-3\] subtract \(3x\) from both sides i guess

Answer 9

i thought you would have to add 10 to 3?

Answer 10

sure you get \]-3x+y=7\]

Answer 11

oops i meant \[-3x+y=7\]

Answer 12

but thats not one of the choices :(

Answer 13

course that is not one of your answer choices
multiply both sides by \(-1\) get \[3x-7=-7\]

Answer 14

im confused

Answer 15

hello