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

6a + y = 6
y = 6 - 6a

then substitute the result (6 - 6a) into the second equation:

-2a + 5(6 - 6a) = 9
-2a + (5 x 6) + (5 x -6a) = 9
-2a + 30 - 30a = 9
-2a - 30a = 9 - 30
-32a = -21
a = \( \frac{-21}{-32} \)
a = \(\frac{21}{32}\)

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.

4a⁵ + 9a⁵ = 13a⁵

A monomial contains one term, a binomial contains two terms, and a polynomial contains more than two terms.

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 - 6a = -2a

A right angle measures 90 degrees and is the intersection of two perpendicular lines. In diagrams, a right angle is indicated by a small box completing a square with the perpendicular lines.