exam Maths Puzzle Numerical Ability

Solve by the elimination method.
x+6y=45
-x+4y=15
What is the solution of the system?

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exam Other Question

Is this one correct?

8*10^6

=80^6
FACTOR THESE Completely? :


1) 6x^2 - 28x + 16


2) x^4 + 2x^3 - 3x - 6


3) x^8 - 1