exam Maths Puzzle Numerical Ability

Ok, I answered this but I want to make sure that I got it right before turning it in.

Solve the system by addition or substitution.
3x - 4y = 8
6x - 2y = 10

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exam Other Question

The base of an isosceles triangle is 12 in. less than the length of the equal sides. If the perimeter of the triangle is 39 in., find the length of each of the sides. Solve the system by graphing.
3x + y = -1
9x + 3y = -3