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# Alg:linear equations

### Review terms/formulas

slopes of parallel lines same slopes (Ex. y=2x +1 and y=2x -5)
slopes of perpendicular lines opposite (signs), reciprocal slopes (Ex. y=3x-2 and y=-1/3x+4)
slope intercept form y=mx+b
standard form Ax+By=C
point slope y-y=m(x-x)
x- and y- intercepts use a t-chart with 0 for one x and 0 for one y; then solve substituting 0 for x to find the missing y; solve substituting 0 for y to find the missing x.
solve for slope slope formula (rate of change) 1) m=rise/run 2) m=y-y/x-x
slope of horizontal line 0
slope of vertical line undefined
Arithmetic Sequences adding or subtracting each time in a sequence (Ex. 1,4,7,10,13,... or 100,95,90,85,80,...)
Arithmetic Sequence Formula A(n)=a+(n-1)d; A=first number in sequence; n=term looking for (100th?, 25th?); d=common difference (number adding or subtracting by in the given list of numbers)
Created by: mhacker