book Maths Puzzle Numerical Ability

Hello! I posted this problem before, but nobody solved it. I'm really having trouble with this. Please help!


x + 2y + 16z = 20
3x + 6y - z = 23
4x + 8y + 2z = 18


It d

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book Other Question
If the product of 5 and a number is increased by 4, the result is 19. What is the number? Graph the function.
f (x) = -2x - 5 ( , ) ( , )
State in words exactly where the points should be located.