book Maths Puzzle Numerical Ability

Could you please help me solve these problems..

x+7y=21

y=1/4x+2

y=-2/3x+4

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book Other Question

Jill Loves math but she hates this problem
The sum of four numbers is 64.
If you add 3 to the first number,3 is subtracted form the secong number the third is multiplied by 3 and 5=4{6)+b