book Maths Puzzle Numerical Ability

solve using substitution
2x + y = 4
3x + 2y = 1

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book Other Question

On your new job, you can choose to be paid in one of 2 ways;
Plan A: A salary of $1600 per month plus a commission of 5% of gross sales;

Plan B: A salary of $1800 per month plu Please help me solve this problem. I don't know if it's correct.
3(5/14+6+1)
Five is over 14+6 and plus 1 is to the rigt of that fraction. Can you help?