Slope Intercept: y = mx + b
The slope and y-int can be easily identified and used to quickly graph the equation.
Point Slope: y - y1 = m(x -x1)
This form is ideal for fing the equation of a line if the slope and a point on the line or two points on the line are known.
Standard: Ax + By = C
The x- and y- ints can be found quickly and used to graph the equation. Slope must be calculated.
Horizontal Line: y = b
If the graph intersects only the y-axis, then y is the only variable in the equation.
Vertical Line: x = a
If the graph intersects only the x-axis, the x is the only variable in the equation.
Also in standard form, A must be greater than or equal to 0, so it cannot be negative in your final answer!
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