exam Maths Puzzle Numerical Ability

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problem:
determine which variable you will substitute for and rewrite as an equation using one variable?

x + y =6
2x - 3y =9

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exam Other Question
In order to earn an A in college math class, a student must score no less than 90% of all possible points. One semester, students with at least 567 points earned an A int he class. Write an inequality to show the number of points possible. using the quadratic equation x² - 4x - 5 = 0,
perform the following task:
solve by factoring,
solve by completing the square,
and solve using the quadratic formula