exam Maths Puzzle Numerical Ability

what is the y-intercept of 3x+y=7

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x(squared)+6x-27=0 Stu has twice as much money invested in stocks as in bonds. Stocks earned 8% interest per year and bonds 2% per year. If Stu earned a total of $400 dollars from his stocks and bonds last year how much money did he have invested in stocks?