exam Maths Puzzle Numerical Ability

1divided by4 times y + 3=-5x

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Can someone show me how to solve by the substitution method. Thanks!

4X - y = -3
y = 4X + 3 a man invested $6000, part of it at 5%simple interest and the rest at 7% simple interest. If his annual interest income is $372, how much did he invest at each rate?