#### Answer

$A(4,3)$,$B(2,0)$,$C(-18,-12)$
$M_{AC}=\frac{-12-3}{-18-4}$
$M_{AC}=\frac{-15}{-22}\approx0.68$
$M_{AB}=\frac{0-3}{2-4}$
$M_{AB}=\frac{-3}{-2}\approx1.5$
Points are not on the same line, because the slopes between the respective points are not equal.

#### Work Step by Step

Step 1: Use the gradient equation $M=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$
Step 2: Solve the gradient between points A and C
Step 3: Solve the gradient between points A and B
Step 4: Points are not on the same line, because the slopes between the respective points are not equal.