Question 386898: My son needs help on his algebra homework and is now working the slope.
Y=-3x;(0,4)
Answer by rapaljer(4671)   (Show Source):
You can put this solution on YOUR website! Your question is not completely clear. Did you want to find the slope of the line y=-3x? If so, the slope of the equation y=mx+b is the coefficient of x, which in this case is slope=m. In your case, the slope is m=-3. Apparently, the line passes through the point (0,4), which is the y-intercept, since x=0. In the equation y=mx+b, b is the y-intercept. I'm thinking maybe you need the equation of a line with slope -3 that passes through the point (0,4). If this is the question, then the line has the equation y=-3x+4.
If you want to ask a followup question, you can re-post the question on www.algebra.com, or send me an Email at my Email address that is given on every page of my website that I've referred to below.
Why don't you check out my own website, and especially take a look at the video that I have posted there. To see it click on my tutor name "rapaljer" anywhere in algebra.com. Look for the link to my website there. From my Homepage, look for the link "Basic, Intermediate, and College Algebra: One Step at a Time", click on "Basic Algebra," and then "Chapter 4," which is my chapter on GRAPHING. Look in the first three sections, 4.01, 4.02, and 4.03 for an explanation on graphing and slope of a line. If you need an explanation on finding the EQUATION of a LINE, then see my Section 4.06. For a higher level of explanation, please take a look at my "Intermediate Algebra" and look in "Chapter 5" for topics on GRAPHING. See also the solutions of many of these exercises in the "MATH IN LIVING COLOR" pages, where the problems are solved in COLOR. My own students and others have been unanimous in telling me that my own explanations are easier to understand than the expensive textbooks that are written for mathematicians and publishers!! MY EXPLANATIONS WERE WRITTEN FOR STUDENTS WHO HAVE A HARD TIME UNDERSTANDING MATH!! And they are all FREE!!
I especially want you to see a video that might be helpful to you. To see all of my videos FREE (videos of me teaching in my younger years before I retired!!), look for "Rapalje Videos in Living Color." Choose "Basic Algebra" and look for the topic "Graphing and Slope of a Line." Try the videos on a variety of topics from Basic, Intermediate, and College Algebra. As I said, everything is FREE. I'm not only not SELLING anything! I'm not even ADVERTISING for anyone!!
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Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus
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