find the equation of line passing through the point p - 13 - 2 and perpendicular to the lines x is equals to y over 2 is equals to z over 3 and x + 2 over minus 3 y - 1 over 2 is equals to z plus one over five
a lady buys some pencils for rupees 3 and an equal number for rupees 6 she sells them for rupees 7 each find the gain or loss percent