3 Linear equations

Matches were used to make the pattern attached:

a

Complete the table:

Number of triangles ($t$t) |
$1$1 | $2$2 | $3$3 | $5$5 | $10$10 | $20$20 |
---|---|---|---|---|---|---|

Number of matches ($m$m) |
$\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ |

b

Write an equation that describes the relationship between the number of matches ($m$`m`) and the number of triangles ($t$`t`).

c

How many matches are required to make $21$21 triangles using this pattern?

Easy

Approx 2 minutes

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Solve problems involving linear equations, including those derived from formulas.