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.

8a - 5a = 3a

To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the > sign and the answer on the other.

8b + 6 > \( \frac{b}{1} \)
1 x (8b + 6) > b
(1 x 8b) + (1 x 6) > b
8b + 6 > b
8b + 6 - b > 0
8b - b > -6
7b > -6
b > \( \frac{-6}{7} \)
b > -\(\frac{6}{7}\)

A parallelogram is a quadrilateral with two sets of parallel sides. Opposite sides (a = c, b = d) and angles (red = red, blue = blue) are equal. The area of a parallelogram is base x height and the perimeter is the sum of the lengths of all sides (a + b + c + d).

The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:

y² - 3y - 28 = 0
(y + 4)(y - 7) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (y + 4) or (y - 7) must equal zero:

If (y + 4) = 0, y must equal -4
If (y - 7) = 0, y must equal 7

So the solution is that y = -4 or 7

The perimeter of a triangle is the sum of the lengths of its sides:

p = x + y + z
p = 9cm + 11cm + 9cm = 29cm