exam Maths Puzzle Numerical Ability

Solve the equation. 25y^2+20y+4=0

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John Craig invested a portion of $15,000 at 10% annual interest and the balance at 6% annual interest. If he earned $1260 for the year from the two accounts, how much did he invest at 10%? I did not reliaze it but there is a second part to the question so I am resubmitted it all at this time. the questions is
The solutions of line a are (3, 3), (5, 5), (15, 15), (3