exam Maths Puzzle Numerical Ability

what is the difference between one variable to equations with two variables.
How are they alike?
and what if It was three variable to equations how are they alike and how are the

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exam Other Question

{3x-y=7
{9x-3y=21
Slove each system of equation using matrices. If the system has no solution, say that it is inconsistent. How can the mode give an idea of what the mean might be?
a.it would be the same as the mean
b. a high frequency of numbers
c. it would be close to the mean
d. the mode and the