exam Maths Puzzle Numerical Ability

solve the system:

1/2x + 1/2y+z= 1/2
1/4x + 1/12y-1/3z=1/4
1/6x + 1/3y-1/2z=3/2

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exam Other Question

Solve the system of equations:

2x+y=4
y=x^2-4x-11

And graph the system of equations: y=x^2-2
y=-2x+1 and label the point(s) of interse Can someone help me solve this problem?

How do I write up this as an equation?

What is the product of three times the difference of a number subtracted from 7 that equals the nmber plus five?

Thanks,
Lyn