exam Maths Puzzle Numerical Ability

solve each of the following system by addition. If a unique solution does not exist, state wheter the system is inconsistent or dependent

x+5y=10
-2x-10y=-20

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exam Other Question
a/a^2-1+9a/a^2-a= Graph the solution set of the following compound inequalities.
a) y is greater than or equal to x and x is less than or equal to 3
b) 2x<y or y> 2+x