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- If two lines are parallel, then their slopes $\cdots$

- If two lines are perpendicular, then their slopes

- A line has equation $y=-2x+3$. What is the slope of another line that is parallel to it?

- If a line has equation $2x-3y+5=0$, what is the slope of another line that is perpendicular to it?

- A line which passes throught $(2,4)$ is also parallel to the line $y=2x+3$. Find its equation.

- Find the equation of a line which goes through the point $(1,-5)$ and is perpendicular to the line $3x-4y-7=0$.

- Find the equation of a line which passes through the origin and is parallel to the line $5x+4y-9=0$.

- Find the equation of a line which goes through the origin and is perpendicular to the line $x=0$

- A line goes through the points $(1,3)$ and $(-1,b)$. For what value of $b$ is this line parallel to $2x-3y-10=0$?

- A line goes through the points $(a,-2)$ and $(2,b)$. If it is also perpendicular to the line $x-y=0$, then the relationship
between $a$ and $b$ is $\cdots$?