ANSWERS: 1
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linear: y=a+bx y=0 and x=4: 0=a+4b (1) y=6 and x=2: 6=a+2b (2) subtract 1 from 2: 6=a-a+2b-4b => -2b=6=>b=-3 now go to 1 and substitute: 0=a+4(-3)=>0=a-12=>a=12, so y=a+bx=>y=12-3x
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