exam Maths Puzzle Numerical Ability

Find the variation constant and an equation of variation where y varies directly as x and y=12 when x=3. The variation constant is k= ???
the equation of variation is y=???

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exam Other Question

Could you help me solve this system of equations:

3(2^x)-2^(x+y)+2=0
5(2^x+1)-2^(x+y+1)=16

i simplified it to be:

3(2^x)-2^(x)*2^(y)+2=0
5*2^(x)*2-2^(x)*2^(y)*2=16

th I need help solving the following problems:

i(2i)(3i) and [radical] -49 - i

These problems come from an Enrichment activity (5-6) and is a puzzle in order to find a hidden