SOLUTION: HOW DO U FIND THE SLOPE AND Y-INTERCEPT OF A LINE WRITTEN IN THE Y-FORM?

Question 73232: HOW DO U FIND THE SLOPE AND Y-INTERCEPT OF A LINE WRITTEN IN THE Y-FORM?
Answer by checkley75(3666) (Show Source): You can put this solution on YOUR website!
Y=mX+b IS THE LINE FORMULA WHERE X&Y ARE A SET OF POINTS, m=SLOPE & b=THE Y INTERCEPT.
IF YOU HAVE A SLOPE & A POINT YOU CAN FIND THE Y INTERCEPT THUS:
POINT IS (2,-4) & THE SLOPE IS 2. NOW SUBSTITUTE THESE FACTS AND SOLVE FOR THE Y INTERCEPT(b)
-4=2*2+b
-4=4+b
b=-4-4
b=-8 SO THE EQUATION OF THIS LINE IS
Y=2X-8
-----------------------------------------------------
ANOTHER APPROACH IS IF YOU HAVE TWO SETS OF POINTS (-1,3) & (3,-5).
YOU FIRST NEED TO FIND THE SLOPE THUS:
(Y2-Y1)/X2-X1)
(-5-3)/(3+1)
-8/4
-2 IS THE SLOPE OF A LINE THROUGH THESE TWO SETS OF POINTS.
NOW USE THE SLOPE & ONE SET OF POINTS & SOLVE FOR THE Y INTERCEPTtHUS:
3=-2*-1+b
3=2+b
b=3-2
b=1 SO THE LINE EQUATION IS
Y=-2X+1
-----------------------------------------------------------------------
HERE ARE THE PLOTS OF THESE TWO EXAMPLES:
(graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = 2x -8 and y = -2x +1).

RELATED QUESTIONS
How do you find the y-intercept of a line when it is given in slope-intercept... (answered by ewatrrr)

How do u write the equation of the line passing through the given points in slope... (answered by rfer)

The slope of a line is 0, and the y-intercept is 6. What is the equation of the line... (answered by reviewermath)

How do I write equation of the line given the slope and y-intercept in slope-intercept... (answered by MathLover1)

how do u find the slope and y-intercept of the equation... (answered by queenofit)

How do you write the equation in slope intercept form of the line that has a slope of 2... (answered by erika514,mothernature31)

If I'm given a slope of 4 and a y-intercept of (0, -8) how do I write the line in slope... (answered by Alan3354)

How do i write the equation of a line,in slope-intercept form, with slope 1/2 and... (answered by checkley71,ilana)

I am Really Confused! I Dont Understand how to Find the Y- Intercept of a line on this... (answered by Alan3354)