The slope is positive for the points (12,3),(-2,-5),(1,15)
The slope of a line is that the quantitative relation of quantity|the quantity|the number} that y will increaseas x will increase some amount.
Slope tells you ways steep a line is, or what quantity y will increaseas x will increase. The slope is constant (the same) anyplace on the road.
One way to think about the slope of a line is by imagining a roof or a side. each roofs and ski slopes may be terribly steep or quite flat. In fact, each ski slopes and roofs, like lines, may be utterly flat (horizontal). you'd ne'er realize a side or a roof that was utterly vertical, however a line may be.
formula of slope for 2 point line =y2-y1/x2-x1
for point (12,3). m=3+1/12 =4/12 =1/3 which is correct.
for point (-2,-5)m=-4/-2=2 which is correct
for point (-3,1) m=2/-3 which is not correct
for point (1,15)m=16/1 which is correct
for point (5,-2)m=-1/5 which is not correct.
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