Remember the formula for a straight line
To remember that `y=mx+c`
She formed a straight line (formula for a straight line) of sandwiches.

Why (`y`) have you made (`m`) egg (`x`) and (`+`) cress (`c`) sandwiches in a line?
Formula for a straight line:
| Why `(y)` have you made `(m)` | `rarr` | `y\ \mx+c` |
| Egg `(x)` and `(+)` cress `(c)` | ||
| `=` | `y=mx+c` |