book Maths Puzzle Numerical Ability

5x-2y=-5
y-5x=3
solve by substitution

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book Other Question

Can someone help me solve this problem?

Ms. Jordan has been given a loan of $2,500 for 1 year. If the interest charged is $275, what is the interest rate on the loan?
Thanks,
Lyn how do you factor 6xsquare+x-2