exam Maths Puzzle Numerical Ability

Solve the system by addition.
2x - 4y = 7
4x + 2y = 9

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exam Other Question

Quadrilateral FGHJ m is the midpoint of the quadrilateral
FM is congruent to HM and JM is congruent to GM . prove that FG is parallel to JH.

I don't know how to do a proof fo Solve the system of equations using the substitution method. If the answer is a uniques solution, present it as an ordered pair (x, y). If not, specify whether the answer is "no solution" or " infinitely many solutions."
-4x + y = 8
2x + 3y = -1