Answer:
Two lines that intersect and form right angles are called perpendicular lines.
X = 1 hr lessons and y = 1/2 hr lessons
x + y = 35......y = 35 - x
40x + 25y = 1115
40x + 25(35 - x) = 1115
40x + 875 - 25x = 1115
40x - 25x = 1115 - 875
15x = 240
x = 240/15
x = 16 <=== there are 16 one-hr lessons
and 19 half-hr lessons
6 students/ 15 students* 100%= 40%
40% of the students voted for soccer~
Sun car dealers pay 18000 to galaxy car for a car worth20000
