Which line is the graph of y = -2x + 2?

line a

line b

line c

line d

Question

Which line is the graph of y = -2x + 2?





line a

line b

line c

line d

mackenzie2013 · Answer

attachment

anonymous · Answer

Alright. If you plug in two numbers as x (take 0 and 1), what would your coordinates be? 
You only need those two numbers to determine which line is the correct one. :)

mackenzie2013 · Answer

So I'd take Y=2^1?

anonymous · Answer

-2(1) +2
-2(0) + 2
:)

mackenzie2013 · Answer

I understand that, but I dont see where it corresponds with the lines.

anonymous · Answer

That would give you your y-coordinate. You have your x-coordinates already.
1 and 0 would be x-coordinates. :)

anonymous · Answer

So say, for 1:
Your coordinates would be (1, 0)

anonymous · Answer

I plugged in 1 into the equation, and I got my y-coordinate.

anonymous · Answer

Do the same for 0, and you should get the line that corresponds with both those points. And there you have your answer.

mackenzie2013 · Answer

So the answer is C?

anonymous · Answer

I got B for the answer, since it has both (1,0) and (0,2)

acxbox22 · Answer

no it is b

anonymous · Answer

Do you see how that works?

mackenzie2013 · Answer

I got it thanks for explaining!

acxbox22 · Answer

your welcome!

anonymous · Answer

Ah, you're welcome. It's a bit tough explaining it online, but I'm glad that you've got it :D

mackenzie2013 · Answer

@anitasonia98  Do you minf helping me with another? Im thinking you do the same but not quite sure.

anonymous · Answer

Of course! Go ahead and shoot me the question!

mackenzie2013 · Answer

What is the equation of the function that is graphed as line a?





y = 2x - 1

y = -x - 1

y = -x

y = 3x

acxbox22 · Answer

slope=-1
yintercept=-1
equation is y=-x-1

anonymous · Answer

Oops. Lemme try this again. So you could do this one of two ways:

You could plug in 0 for x, and see what you get.

Or you could figure out the slope and y-intercept (I prefer doing the plugging in way, because it's easier and less time-consuming). :)

mackenzie2013 · Answer

alright so just try those with 0 till I get the answer?

anonymous · Answer

Yep. :)

mackenzie2013 · Answer

The first one?

anonymous · Answer

Oh, okay, I see what's going on. So if you have two equations that give you the same answer for one value (0), plug in a different value. Let's try 1 next :)

mackenzie2013 · Answer

Ok so take y=-0 -1 therefor IK get -1? right?

anonymous · Answer

Yup! Since that matches the line, that'll be your equation :)

mackenzie2013 · Answer

Thanks a bunch!