X = 47 + 9y
xy = 1860
y(47 + 9y) = 1860
47y + 9y² = 1860
9y² + 47y - 1860 = 0
> using a quadratic equation solver on a calculator but you can also use the quadratic equation = [-b+/- √(b²-4ac)]/(2a)
> only integer solution is x = 12
12y = 1860
y = 155
integers are 12 and 155
The first law: multiplication
The second law: division
The third law: brackets
Negative powers
Power of zero
Fractional powers
The original price is $30 because 40% off of 12 = 30
Step-by-step explanation:
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