exam Maths Puzzle Numerical Ability

For what values of k will the system of equations be inconsistent?

x=6y+6
kx-3y=6

work shown needed please.

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exam Other Question

state the number to replace ? a + 3a= 1a = 3a = (1 + ?) a

Distributive property

Thank you f(x)=2x
g(x)=x2
find the domain of each combination: a.(f+g)(x) b.(f-g)(x)
c.(fg)(x) d.(f/g)(x)
?