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- If two lines have the same slope and the same $y$-intercept, they are said to be $\cdots$?

- If two lines have the same slope but different $y$-intercepts, then they are $\cdots$

- If two lines have different slopes but the same $y$-intercepts, then $\cdots$

- How many solutions does the linear system $2x+3y=8,~4x+6y=-16$ have?

- How many solutions does the linear system $-2x+5y=9,~2x-5y=-9$ have?

- Given the linear system $2x+3y=8,~kx+6y=16$, find the value of $k$ for which there are infinitely many solutions.

- Given the linear system $2x+3y=8,~4x+6y=c$, find the value of $c$ for which there are infinitely many solutions.

- Given the linear system $2x+3y=8,~4x+ky=16$, find the value of $k$ so that the system is coincident.

- Given the linear system $2x+3y=8,~4x+6y=c$, find a restriction on $c$ so that the system is inconsistent.

- Given the linear system $2x+by=8,~kx+6y=16$, find appropriate choices for $b,k$ that will ensure consistency.