exam Maths Puzzle Numerical Ability

Can you please help me solve using the substitution method?

x + 7y = 16
-3x + 6y = 33

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exam Other Question

Convert to exponential form. For example, the exponential form of "log5 25 = 2" is "52 = 25".
log 125 25 = 2/3 If "a" is a negative number find
(a)+a+(-2a)+(-a)