The point-slope form:

We have the points (5, -3) and (-2, 9). Substitute:

Alan will make $28.50 from 5 large necklaces and $15.30 from 3 small necklaces. $43.80 in total :)
To get from 8.4 to 10 in multiplication, we need to multiply 8.4 by 10/8.4
That means that if we multiply 30 by 10/8.4 we get the answer
which is 35,714
The same with the other
8.4 times 100/30 = 28
The digit in the tens place is 10 times bigger than the digit in the ones place