Question

MEDAL AND FAN AWAREDED!

Select the equation of a line that is perpendicular to the line on the graph and passes through the point (-1, 2).

y = 2x + 4
y = - 2x + 2
y = - 1 over 2 x + 2
y = 2x - 1

Answer 1

@Directrix last one for the day :)

Answer 2

First thing, we have to get the slope of the line on the graph.

Will you pick any two points on the graph and post them here?

Answer 3

Alright, -2,-1?

Answer 4

(-2, ) looks like it goes to zero so (-2,0). Look again and see if you agree.

Answer 5

That sounds right, yeah...

Answer 6

And, a second point is (0, - 1)

Answer 7

We have to get the slope of the line on the graph.

Answer 8

To do that, we use the slope formula with the two points.

Answer 9

Yes, the slope of the line is -1/2.

We want the equation of a line perpendicular to the one on the graph.

Answer 10

Perpendicular lines have slopes that multiply to -1.

Answer 11

What number times -1/2 = - 1

Answer 12

Would y = 2x + 4 be the correct answer? I went a little bit ahead haha.

Answer 13

Yes, you did.

The slope would be 2, yes.

The line has to pass through (-1,2) so yes,

y = 2x + 4 is what I got. Same as yours.

Answer 14

When you have time, check out this online calculator.

http://www.webmath.com/equline2.html

Answer 15

Great, thank you buddy

Answer 16

You're welcome.

Answer 17

I checked out that calculator, it's not in my bookmarks haha.

Answer 18

Good that you added it.