Forward Grade 6 The Number System. 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: $3x - 2$.

$7.04 - 1.68 = 5.36$.

Multiply by the reciprocal: $\dfrac{3}{7} \times \dfrac{7}{3} = \dfrac{21}{21} = \dfrac{1}{1}$.

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: $-2x - 4$.

$7.00 + 1.62 = 8.62$.

Multiply across: $\dfrac{3 \times 1}{5 \times 6} = \dfrac{3}{30} = \dfrac{1}{10}$.