Which rule matches the function graphed below?
y= - 2x.
y= x+4
y = 2x
y = x -4
2 answers:
Take any two points to find the slope of a line. The slope will be equal to: (y2-y1)/(x2-x1) and any two points will do... I'll use (-2,4) and (0,0) :P so the slope is: (0-4)/(0--2)=-4/2=-2, now we know the slope is -2 so: y=-2x+b (now we know b=0, but I'll use another point anyway to solve for b) Let's use (-2,4) again... 4=-2(-2)+b 4=4+b b=0 So the line is: y=-2x
y=-2x We know this because the slope is -2 (slope is found using rise/run, in this case the rise is 2 and the run is -1, so 2/-1=-2), and the y-intercept is at 0 (the y-intercept is the point at which a line crosses the y-axis). :)
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Hope this helped!
Isnt there a youtube video with that? Im not sure... But thats where ill look for proof.. :)
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I think #2
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