Write an equation for $q$q in terms of $p$p.

Write an equation for $n$n in terms of $m$m.

Write an equation for $b$b in terms of $a$a.

Write an equation for $v$v in terms of $u$u.

Determine the equation of a line, given its graph, the slope and y-intercept, the slope and a point on the line, or two points on the line.