exam Maths Puzzle Numerical Ability

3x+3y+z=21
x-3y+2z=-5
8x-2y+3z=24

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exam Other Question

The logarithm of a product is equal to the sum of the logarithms and the logarithm of a sum or a difference usually does not simplify. Can someone please help me I have a problem b re-write the equation as a function of x.
f(x)

-3x+4y=11