1.Given the equation of a line y = 2/5x - 2, the slope and y-intercept are respectively:
2.Given the equation of a line, y = -1/3x , the slope and y-intercept are respectively:
3Find the equation of a line passing through points (5, 3000) and (7, 8000)..
2006-08-10 10:37:08 · 9 answers · asked by wipp 1 in Education & Reference ➔ Homework Help
y = mx + b
b= y intercept
m= slope
so number 1 would be
slope = 2/5
y intercept= -2
and number 2 would be
slope= -1/3
y intercept= 0
2006-08-10 10:41:44 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Pretty simple
(1) For slope, that is pretty simple, 2/5 is your slope, to find the y interecept, set x = 0, therefore -2 is your y intercept
(2) Same thing, -1/3 and y int=0
(3) a little more fun from the algebra 1 book, good old point slope
(5, 3000) and (7, 8000)
So take y-y(1) and x-x(1) and divide (5000/2)=2500=m(slope)
then take one set of coordinates (5, 3000) lets say and plug them into the y= ax +b formula (where a is slope and b is offset)
y-3000 = 2500 (x-2) ...
y-3000 = 2500 x - 5000
y = 2500 x - 2000
2006-08-10 17:47:29 · answer #2 · answered by Brian H 2 · 0⤊ 0⤋
1. slope: 2/5, y-intercept: -2
2. slope: -1/3, y-intercept: 0(none)
3. graph the points and find the slope using m=rise/run
then use the equation y-y1 = m(x-x1) to find the
answer. this is the only way to find the answer, so
don't waste ur time reading other bogus answers.
2006-08-10 17:59:30 · answer #3 · answered by Anonymous · 0⤊ 0⤋
y = mx + b
m is the slope andb is the y-intercept
therefore...
1. slope is 2/5 and y-intercept is -2
2. is -1/3 intercept is 0
use m = (y - y1)/(x - x1)
3. m = (8000 - 3000)/ (7 - 5)
= 2500
therefore.....using y = mx + b
pick either ordered number pair
8000 = 2500*7 + b
8000 = 17500 + b
cancel to get
-9500 = b
substitute into y = mx + b formula
y = 2500x - 9500
as they used to say in Geometry
Q.E.D.
2006-08-10 17:48:20 · answer #4 · answered by Gemelli2 5 · 0⤊ 1⤋
For 1 and 2, the slope of y=mx + b is m, the co-effecient of x, or number you multiply x by. The y-intercept is b, the number you add, when it's in that form.
For 3, find the slope, (y2-y1)/(x2-x1) and use the point-slope form.
2006-08-10 17:44:46 · answer #5 · answered by Anonymous · 0⤊ 0⤋
That's cheating and the answers are worth more than 10 lousy points.
2006-08-10 17:44:39 · answer #6 · answered by Peace2All 5 · 0⤊ 0⤋
You're supposed to solve the problems yourself. Any answers you receive, from here, would be a form of cheating.
2006-08-10 17:42:59 · answer #7 · answered by Anonymous · 0⤊ 0⤋
2 words...graphing calculator
2006-08-10 17:39:41 · answer #8 · answered by Anonymous · 0⤊ 0⤋
www.askdrmath.com
2006-08-10 17:43:11 · answer #9 · answered by PoohBear 4 · 0⤊ 0⤋