Answer
$y=2x-3$
Work Step by Step
The line crosses the y-axis at $y=-3$ so $b=-3$.
Thus, our equation is $y=mx-3.$
Use the point $(1.5,0)$ to substitute into the equation to obtain:
$y=mx+1\\0=m(1.5)-3\\3=1.5m\\2=m$
Thus the equation is: $y=2x-3$