9.3 Forming and solving equations — Practise with help

1. $n+5$.
2. $x=4$.

If an answer differs, revisit Section 8.1 for writing expressions and Section 9.1 for solving equations.

Undo addition, then multiplication.

Try the first operation or write the equation before opening the full solution.

Subtract $2$: $3x=12$. Divide by $3$: $x=4$.

Let the number be $n$ and write an equation.

Try the first operation or write the equation before opening the full solution.

Let it be $n$: $n+9=23$, so $n=14$.

Let the smaller integer be $n$; the next is $n+1$.

Try the first operation or write the equation before opening the full solution.

Equation $2n+1=25$, so $n=12$. The integers are $12$ and $13$.

Use perimeter = two widths + two lengths.

Try the first operation or write the equation before opening the full solution.

$2w+2(w+2)=28$, so $4w=24$ and $w=6$. Length $8$ cm.

Let $v$ be the visit count.

Try the first operation or write the equation before opening the full solution.

Equation $4+3v=25$, so $3v=21$ and $v=7$.