Answer
$y=19/4*x+32$
Work Step by Step
Year 0: $(0, 32)$
Year 4: $(4, 51)$
$y=mx+b$
$m=(51-32)/(4-0)$
$m=19/4$
$y=mx+b$
$51=19/4*4+b$
$51=19+b$
$51-19=19+b-19$
$32=b$
$y=19/4*x+32$
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