exam Maths Puzzle Numerical Ability

[4x 3y]=[12 -1]

Please Explain because my Teacher did not

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exam Other Question

What is the domain for y=logbase2(3x-6)?
Is it :
a)x is greater than 0
b)x is greater than or equal to 0
c)x is greater than 2 OR
d)x is greater than-2 I have eight more quarters than dimes. If the coins are worth $6.20, how many dimes are there?