ISASP Grades 6-8 Expressions and Equations. Practice it free.

The terms $2y$ and $3y$ are like terms: $2y + 3y = 5y$. The constant $6$ stays the same, so the expression is equivalent to $5y + 6\textsf{.}$

Combine $x$-terms: $1x + 2x = 3x$. Combine constants: $6 - 8 = -2$. Result: $3x - 2$.

Any base to the first power equals itself: $3^{1} = 3\textsf{.}$

The base $7$ appears $4$ times as a factor, so $7 \times 7 \times 7 \times 7 = 7^{4}$.

Multiply first: $3 \cdot 9 = 27$. Then $2 + 27 - 5 = 24$.

$\,2^3 = 2 \cdot 2 \cdot 2 = 8$.

The terms $4x$ and $x$ are like terms: $4x + x = 5x$. The constant $9$ stays the same, so the expression is equivalent to $5x + 9\textsf{.}$

Combine: $2x + -4x = -2x$, $-7 + 3 = -4$. Result: $-2x - 4$.