A rectangle is a parallelogram containing four right angles. Opposite sides (a = c, b = d) are equal and the perimeter is the sum of the lengths of all sides (a + b + c + d) or, comonly, 2 x length x width. The area of a rectangle is length x width. A square is a rectangle with four equal length sides. The perimeter of a square is 4 x length of one side (4s) and the area is the length of one side squared (s²).

To solve this equation, isolate the variable for which you are solving (b) on one side of the equation and put everything else on the other side.

-6b + 2y = 3b + y - 9
-6b = 3b + y - 9 - 2y
-6b - 3b = y - 9 - 2y
-9b = -y - 9
b = \( \frac{-y - 9}{-9} \)
b = \( \frac{-y}{-9} \) + \( \frac{-9}{-9} \)
b = \(\frac{1}{9}\)y + 1

A cylinder is a solid figure with straight parallel sides and a circular or oval cross section with a radius (r) and a height (h). The volume of a cylinder is π r²h and the surface area is 2(π r²) + 2π rh.

To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.

4a - 8a = -4a

The entire length of this line is represented by AD which is AB + BD:

AD = AB + BD