Find the GCD of the following:

$2a^2+a,4a^2-1$

Find the GCD of the following:

$3a^2,5b^3,7c^4$

If the GCD of the following: $x^4-1,x^2-1$ is $x^k-1$, find the value of $k$

Find the GCD of the following: $a^3-9a{x}^2,(a-3x{)}^2$

Draw the graph for $y=2x$.

Draw the graph for $y=4x-1$.

Draw the graph for $y=\left(\frac{3}{2}\right)x+3$.

Draw the graph for $3x+2y=14$