exam Maths Puzzle Numerical Ability

The area of a rectangle is 154 sq. Ft. If its width is 3 ft. less than its length what are its dimensions? I need to use a quadratic formula to solve it.

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could you show me how to graph this;
Solve the system by addition.
5x - 4y = -5
x - 2y = -7

The answer I got was x-3; y=5

Thank you so much! Your parents purchased a house for $120,000. After 22 years the house had doubled in value. What was the simple interest rate that could generate this return on their investment?