exam Maths Puzzle Numerical Ability

Solve using REF

x-y-2z=0
-2x+5y+10z=-3
3x+y=0

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exam Other Question

X -2, -1, 0, 1, 2
Y .25, .5, 1, 2, 4

Given the table above graph the function identify the graph, explain your choice and give the domain and range as shown in the graph, and a
1/2x-9=0

write in standard form using only intregers