exam Maths Puzzle Numerical Ability

4x^2+2xy-10x-5y

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exam Other Question

find values for m and b in the following system so that the solution to the system is (-3,4)

5x+7y=b
mx+y=22

5(-3)+7(4)=13
-6(-3)+4=22

Is this all the steps or am I missing something? What does 2 log2 8 - log4 256 mean or equals becuase I have no idea on what it means?...Help Me please