Answer
y=8
Work Step by Step
Equation of a line in point-slope form is
$y-y_{1}=m(x-x_{1})$
Given: m=2, $x_{1}=1$ and $y_{1}=4$
Therefore, equation of the line is
$y-4=2(x-1)$ or $y=2x+2$.
When x=3, $y=2\times3+2=8$
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