exam Maths Puzzle Numerical Ability

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Of 30 students in a class, 15 passed. What percentage of the students passed?

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I would like some help i do not understand -3x+2y=2. I need to show how to graph it also can you please help me.
Thanks for your time
Zack Brooks
9th grade
Combine like terms.
2a2 + 7a + 5 + 3a2 + 7a - 1