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.

9c + 9 > 3 + c
9c > 3 + c - 9
9c - c > 3 - 9
8c > -6
c > \( \frac{-6}{8} \)
c > -\(\frac{3}{4}\)

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

6a + 6y = -4a + 4y + 9
6a = -4a + 4y + 9 - 6y
6a + 4a = 4y + 9 - 6y
10a = -2y + 9
a = \( \frac{-2y + 9}{10} \)
a = \( \frac{-2y}{10} \) + \( \frac{9}{10} \)
a = -\(\frac{1}{5}\)y + \(\frac{9}{10}\)

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.

7a + 7a = 14a

A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).

The circumference of a circle is the distance around its perimeter and equals π (approx. 3.14159) x diameter: c = π d. The area of a circle is π x (radius)² : a = π r².