exam Maths Puzzle Numerical Ability

y=-2/3x+4 find the "y"..using x=-6

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1. 2.
5x+2y-z=-7 x-2y-3z=-1
x-2y+2z=0 2x+y+z=6
3y+z=17 x+3y-2z=13

3. 4. x+3y+z=0
x+y+z=6 x+y-z=0
2x-yz+z=3 x-2y-4z=0
3x-z=0 There are 10 more boys than girls in a class. If one more girl joins the class, there will be twice as many boys as there are girls. How many boys and how many girls are there in the class?