2007-09-17 12:30:37 · 9 answers · asked by StarStruck 2 in Science & Mathematics ➔ Mathematics
Two points are required to draw a straight line.
Two suitable points are:-
(0 , 8) and (4 , 0)
Draw a line thro` these points.
2007-09-18 11:17:01 · answer #1 · answered by Como 7 · 2⤊ 0⤋
If only it were that simple.
In the equation y = mx + b, there are 4 variables, and each has a specific meaning. y and x are coordinates on a standard Cartesian Coordinate plane, so we'll set those aside for now. m is the slope, which is the change in y divided by the change in x. Two points on the line y = 3x would be (2,6) and (3,9), and if you divide 9-6 by 1, you get the slope, 3. b is the y-intercept. So, when x = 0, y = b.
Specifically, for the line y = -2x + 8, you can plot the y-intercept first. Go up the y axis until you reach the point (0,8), and that will be your y-intercept. From there, go down two and to the right 1 because -2 = -2/1. This will produce a second point (1,6). Drawing a line through those two points should be a graph of the line y = -2x + 8.
2007-09-17 19:43:52 · answer #2 · answered by Bob S 2 · 0⤊ 2⤋
y = -2x + 8
Ok, first you need to understand y=mx+b
Mx is your slope ( - 2x ) ( you will go down 2 on the y axis and then right 1 because it's -2/1 =]
Then the B is your Y axis number. So put a point on the 8 of the y axis and then go down 2 , to the number 6 on the y axis and the one to the right. So the coordinates should be (0,8) and (1,6) - Hope you get it. I did it with out a graph, so graph it just to make sure.
2007-09-17 19:40:18 · answer #3 · answered by Lloan 2 · 0⤊ 0⤋
for each value of x you need to calculate y
so
x, y
-5, 18
-2, 12
0, 8
2, 4
4,0
5, -2
In this case its a straight line graph.
2007-09-17 19:42:36 · answer #4 · answered by mark 6 · 0⤊ 0⤋
y=2x+8
when x=0,y=8
when y=0, x=-4
the graph is a straight line passing through the points (0,8) and(-4,0).
2007-09-17 19:37:29 · answer #5 · answered by Anonymous · 0⤊ 1⤋
you go up 8 on on the y axis then from that pt. u go down two, to the right one, then draw a line.
2007-09-17 19:37:26 · answer #6 · answered by yo11 1 · 0⤊ 1⤋
nooooooooo you find -2 no the x-axis then from there you go up 8
2007-09-17 19:38:30 · answer #7 · answered by nice cute chick 2 · 0⤊ 1⤋
give x a value to solve y plot coordinates and get ruler out and draw line
2007-09-17 19:36:13 · answer #8 · answered by dwinbaycity 5 · 0⤊ 1⤋
um, yes, what's your problem, you seem to know what your talking about
2007-09-17 19:34:55 · answer #9 · answered by some random person 4 · 0⤊ 1⤋