Notebooks cost $ 1.20 each. this weekend they will be on sale for $ 0.80. what percentage is the sale

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10

Someone me! if you’re smart you can solve this!

What is the greatest number of parts of a circle that can be formed by cutting the circle with 7 straight cuts? (note: the parts do not have to be equal in size)