Why is the slope not -0.4 like it says in the point-slope form. Isn't the format of the point-slope form y − y1 = m(x − x1) with "m" being slope. The answer says the slope is -2.5, which makes sense after converting to slope-intercept form. But why can't you just take the slope ("m") from the point-slope form?
Look again at the problem statement. The equation is given in the form $x-x_0=\frac1m(y-y_0)$, not $y-y_0=m(x-x_0)$. It’s not in point-slope form. It’s a bit of a trick problem meant to test if you’re really paying attention.