Look at the patterns made by matchsticks. Complete the tables and find a general formula.
Number of double squares (x) | 1 | 2 | ||||||
Number of matchsticks (y) | 7 | 12 |
General Formula :
Number of matchsticks = Number of double squares + 2
Number of double squares (x) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
Number of matchsticks (y) | 7 | 12 | 17 | 22 | 27 | 32 | 37 | 42 |