Why is it necessary to check solutions to equations contating rational expressions?

If (-2, y) lies on the graph of y = 3x, then y = ?

There are 150 adults and 225 children at a zoo. If hte zoo makes a total of 5100 from the entrance fees, and the cost of an adult and a child is 31 how much does it cost each parent for a parent and a child

A small company's net income for the first six month of the year was 76,500 and for the last six months it was 100,000 what is the ratio of the first six months of the year to the last six month

Marlon took a total of 12 pages of notes during 3 hours of class. After attending 4 hours of class, how many total pages of notes will Marlon have in his notebook? Assume the relationship is directly proportional.

In a 30 60 90 triangle if the long leg is 12 what is the short leg

Solve for p (p+3) 2-64 -61‾‾‾√ and 61‾‾‾√ 6‾√ and 8‾√ 5 and - 11 -5 and 11

Which of the following is a step in the investment planning process? A. Evaluate your risk tolerance level. B. Monitor your spending every 5 years. C. Make major purchases before you start planning. D. Monitor your investment plan every 10 years.

Which expression is equivalent to 28 (15+9) ? 28 + 15 x 28 + 9 28 x 15 + 9 28 + 15 + 28 + 9 28 x 15+28 x 9

9. 1/2 (16 + 4 + 4) + (6 X 4 = 8) I do not no how to do this

What is the minimum value of the function y=x^2+3x-4?