Slope:
Slope = Rate of Change
Slope =
negative slope decreasing
positive slope increasing
zero slope constant/horizontal
undefined slope vertical
Two parallel lines have the same slope but different y intercepts, no solution]
Two perpendicular lines, the product of two slopes equal -1
Relation between two lines:
Line 1:
Line 2:
One Solution
Intersect
No Solution
Parallel
Infinite Number of Solutions
Same Line
Equation of the Circle:
Standard Form:
Center:
Radius:
General Form:
Center:
Radius:
In addition:
Any point:
Inside: $~$\big(x_1-h)^2+\big(y_1-k)^2
Outside: