Answer
$y=0.5x-11.75$
Work Step by Step
$y=mx+b$
The slope is $\frac{1}{2}$, therefore the coefficient of $x$ will be $0.5$.
($m=0.5$)
$(3.5,-10)$ is a point of the line (if $x=3.5$ then $y=-10$)
$-10=3.5*0.5+b$
$-10=1.75+b$
Therefore $ b=-11.75$
So the equation is $y=0.5x-11.75$
