Book Maths Puzzle Algebra

I need help on this equation please

2x^2 + 5x - 3 = 0

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In a college there are 5 more seniors than juniors. In an honor party, 8 percent of the juniors and 5 percent of the seniors were invited. The total number of students invired to this party was 10. How many students were in the college. i'm trying to help my daughter with her math homework and i'm stuck,i have 6 problems to graph input,rule,output,ordered pair, 1. y=-3x,x+y=-3,y-2x=4,2y=x-6,x-3y=-9, and y=1/3 x + 1. If you can help I would appreciate it..