Problem $1(9$ pts$)$: Straight line mechanism

An Evans approximate straight line mechanism shown below.

$1\mathrm{.}1(6$ pt$)$ Make a drawing to scale that shows a dyad linkage that will power this device from a motor and limit the motion to just the arcs that are traced out in the image.

$1\mathrm{.}2(2$ pt$)$ Use Gruebler's equation to calculate the Degrees of Freedom of the full resulting mechanism.

$1\mathrm{.}3(1$ pt$)$ What type of isomer is the resulting mechanism and why?