Which of the following lines has a slope of -1/2?

x + 2y = 0
x - 2y = 0
-x + 2y = 0

Question

Which of the following lines has a slope of -1/2?

x + 2y = 0
x - 2y = 0
-x + 2y = 0

jadedry · Answer

There is a basic equation for linear graphs:

Y = mx + b

where M is the slope, and B is the Y intercept. 

in this case b is 0, as the line starts at the origin.

If you take the first equation , and convert it to mx + b form you will get:

$$x+2y = 0$$

$$2y = - x$$

$$y = -1/2x$$

therefore m = -1/2 , therefore the answer is x+2y = 0

texaschic101 · Answer

put your answer choices in y = mx + b form....and then compare the slopes...the slope will be the number in the m position.

Example :
-x + 2y = 0
2y = x + 0
y = 1/2x + 0/2


the number in the m position is 1/2...so in this one, the slope is 1/2...not the one you want. Continue to check your other answer choices to find the slope and you will eventually find the slope of -1/2.

anonymous · Answer

Oh, okay. Thank you both very much. :) You've helped a lot.