Question 234367: i have two tables i have to write functions rules for i know what the difference is between them but i dont know who to write it or explain it my book doesnt show me the first table is x- 1,2,3,4 y- 25,30,35,40
the second table is x-1,2,3,4 y $10.00, $12.50,$15.00,$17.50 im sure i can do it i just dont know how to write it please help me
Answer by scott8148(6628)   (Show Source):
You can put this solution on YOUR website! for the 1st one, y changes by 5 when x changes by 1 ___ so y = 5x + ?
___ think of the ? as the "adjustment"
___ when x is 2, y is 30 ___ 30 = 5(2) + ? ___ 30 = 10 + ? ___ so ? is 20
___ the function is y = 5x + 20
the 2nd one works the same as the 1st one
___ y changes by $2.50 when x changes by 1 ___ y = $2.50 x + ?
___ when x is 1, y is $10.00 ___ $10.00 = $2.50(1) + ? ___ $7.50 = ?
___ y = $2.50 x + $7.50
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