SOLUTION: What is the function for x=10,15,20,25 y=337,340,343,346

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Question 916111: What is the function for x=10,15,20,25 y=337,340,343,346
Answer by MathLover1(20850) About Me  (Show Source):
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x=10,15,20,25 y=337,340,343,346
these are ordered pairs:
(10,337),(15,340),(20,343),(25,346)
use two points to find a slope and equation y=ax%2Bb of a line:
Slope a is a=%28y-y%5B1%5D%29%2F%28x-x%5B1%5D%29
a=%28337-340%29%2F%2810-15%29
a=%28-3%29%2F%28-5%29
a=0.6
find b
337=0.6%2A10%2Bb
337=6%2Bb
337-6=b
331=b

so, equation will be: y=0.6x%2B331