exam Maths Puzzle Numerical Ability

Solve by elimination...
3x-y=21
2x+y=4

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exam Other Question

Solve each of the following systems by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent.
2x+3y=1
5x+3y=16 FIND THE MIDPOINT OF THE SEGMENT HAVING THE GIVEN ENDPOINTS.
(-SQUARE ROOT 7, 1) AND (0,SQUARE ROOT 3)