Hi, 

*Note: Note using y = mx + b

x=0 corresponding to 1993 when CPI is 144.5 in 1993

y = mx + 144.5

m = 39.7/10 (change in y over change in x)

y = 3.97x + 144.5

Estimate CPI in 2007   Note: 14 years have passed

y = 3.97*14 + 144.5

What rate is CPI increasing 3.97/yr beginning in 1993



x^2-5x+6=0

factoring: 

representing as a PRODUCT,in this case(x-?)(x-?)...according to signs shown

(x-3)(x-2)works as -3x + -2x = -6x and (-3)*(-2) = 6 

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