A trapezoid is a quadrilateral with one set of parallel sides.

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.

2a⁹ + 8a⁹ = 10a⁹

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.

6a - 7a = -1a

You need to find the value of c so solve the first equation in terms of y:

-c + y = -7
y = -7 + c

then substitute the result (-7 - -1c) into the second equation:

7c - 5(-7 + c) = 7
7c + (-5 x -7) + (-5 x c) = 7
7c + 35 - 5c = 7
7c - 5c = 7 - 35
2c = -28
c = \( \frac{-28}{2} \)
c = -14

The coordinate grid is composed of a horizontal x-axis and a vertical y-axis. The center of the grid, where the x-axis and y-axis meet, is called the origin.