For parallel lines with a transversal, the following relationships apply:

• angles in the same position on different parallel lines equal each other (a° = w°, b° = x°, c° = z°, d° = y°)
• alternate interior angles are equal (a° = z°, b° = y°, c° = w°, d° = x°)
• all acute angles (a° = c° = w° = z°) and all obtuse angles (b° = d° = x° = y°) equal each other
• same-side interior angles are supplementary and add up to 180° (e.g. a° + d° = 180°, d° + c° = 180°)

Applying these relationships starting with x° = 149, the value of w° is 31.

The area of a parallelogram is equal to its length x width:

a = l x w
a = a x b
a = 7 x 2
a = 14

The slope-intercept equation for a line is y = mx + b where m is the slope and b is the y-intercept of the line. From the graph, you can see that the y-intercept (the y-value from the point where the line crosses the y-axis) is -3. The slope of this line is the change in y divided by the change in x. The endpoints of this line segment are at (-2, 1) and (2, -7) so the slope becomes:

Plugging these values into the slope-intercept equation:

y = -2x - 3

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.

4a⁹ + 3a⁹ = 7a⁹

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 equal sign and the answer on the other.

-9c + 8 = \( \frac{c}{3} \)
3 x (-9c + 8) = c
(3 x -9c) + (3 x 8) = c
-27c + 24 = c
-27c + 24 - c = 0
-27c - c = -24
-28c = -24
c = \( \frac{-24}{-28} \)
c = \(\frac{6}{7}\)