Linear Equation

Vertical Line

A line on the coordinate plane where all points on the line have the same x-coordinate. A vertical line has no slope. Or put another way, for a vertical line the slope is undefined. x=a

Horizontal Line

A straight line on the coordinate plane where all points on the line have the same y-coordinate. A horizontal line has a slope of zero. As you move to the right along the line, it does not rise or fall at all. and the slope is zero. y=b

Slope

A surface of which one end or side is at a higher level than another. a rising or falling surface

Linear Equations

An Equation between two variables that gives a straight line when plotted on the graph.

Negative Slope

If a line has a positive slope (i.e. m > 0 ), then y always increases when x increases and y always decreases when x decreases. Thus, the graph of the line starts at the bottom left and goes towards the top right.

Positive slope

If a line has a positive slope (i.e. m > 0 ), then y always increases when x increases and y always decreases when x decreases. Thus, the graph of the line starts at the bottom left and goes towards the top right.

Y-Intercept

Where a straight line crosses the Y axis of a graph.

Y=mx+b

y = how far up x = how far along m = Slope or Gradient (how steep the line is) b = the Y Intercept (where the line crosses the Y axis)