MathProblemsBank

12.5 Olympic Algebra

Condition: what is the area of the figure, the points of which are set by the \ [\ begin {array} {l} | -15 x-3 y-21 | -30 x+6 y-78 | -3 y-6s = 15 x-6 y+63 \ ent {arry \]]

Olympiad Problems in Algebra