1 / 11

Direct Variation

Direct Variation. y = mx (no b) Lines that go through the origin Y intercept of zero Slope also called constant of variation (variation constant). Examples of Direct Variation y = -2x y = 2x. Checking for Direct Variation Graph --> is it a straight line through the origin?

dusty
Download Presentation

Direct Variation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Direct Variation • y = mx (no b) • Lines that go through the origin • Y intercept of zero • Slope also called constant of variation (variation constant)

  2. Examples of Direct Variationy = -2x y = 2x

  3. Checking for Direct Variation Graph --> is it a straight line through the origin? Equation --> does it fit y = mx? (may need to solve for y)

  4. Do these lines illustrate direct variation?y = -1/2x x = -3

  5. What is the variation constant?y = -1/2x x = -3

  6. Are these equations direct variation? y = 5x y = -3/4x y = -2x - 7

  7. Are these equations direct variation? y = 5x --> Yes! y = -3/4x --> Yes! y = -2x - 7 --> No (y-int not 0)

  8. Are these equations direct variation? 2x + y = 0 -x + y = -1 4x - 5y = 0

  9. Are these equations direct variation? 2x + y = 0 --> y = -2x --> YES -x + y = -1 --> y = x - 1 --> NO 4x - 5y = 0 --> y = 4/5x --> YES

  10. Online Animation www.classzone.com

  11. Homework p256 #2-8 E, 11-22 C6, 58-62 E

More Related