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Just Enough Algebra

Section B.2 Formulas used to find constants

Rate of Change Formula

rate of change =change depchange indep=1st dep - 2nd dep1st indep - 2nd indep

Intercept (of Linear) Formula

intercept=depslopeindep

Percent Change Formula

  • If a quantity changes by a percentage corresponding to growth rate r, then the growth factor is
    g=1+r
  • If the growth factor is g, then the growth rate is
    r=g1

Growth Factor Formula

If a quantity is growing (or decaying) exponentially, then the growth (or decay) factor is
g=ast
where s is the starting amount and a is the amount after t time periods.