What is (9+y)^2-y^2=-7x+7 in standard form?

You have two cards with a sum of -12 in both hands. a. what two cards could you have? b. you add two more cards to your hand, but the total sum if the cards remains the same, (-12).

The slope of the line whose equation is 3y = 2x - 3 is 2 2/3 3/2

For what values of a is the sum of the fractions 2a−1 / 4 and a−1 /3 positive?