Hey, i just took the sample ADA test. i had a couple QR questions that i did not get correct. I was wondering if someone could help me out with the answers and how to solve them.

12). Which of the following is the equation of the line that contains the

points (3,-1) and is perpendicular to the line y= 3x+ 3.

the answer is y= (-1/3)x.

I can figure out the -1/3, since it is perpendicular and therefore the negative inverse.

32.) If y = (x+2)/(x-3), then which of the following is equal to y.

answer is (3y+2)/(y-1)

35.) What is the maximum number of 3 inch square(square is 3 inches on each side) that can be cut out from a sheet of tin 19 x 23 inches.

The answer is 42, i keep getting 48!

Thank you all so much!

12). Which of the following is the equation of the line that contains the

points (3,-1) and is perpendicular to the line y= 3x+ 3.

the answer is y= (-1/3)x.

I can figure out the -1/3, since it is perpendicular and therefore the negative inverse.

32.) If y = (x+2)/(x-3), then which of the following is equal to y.

answer is (3y+2)/(y-1)

35.) What is the maximum number of 3 inch square(square is 3 inches on each side) that can be cut out from a sheet of tin 19 x 23 inches.

The answer is 42, i keep getting 48!

Thank you all so much!