exam Maths Puzzle Numerical Ability

Please? I need help? Thank you.

solve by graphing: x - 2y = 8
x + y = - 1

solve by substitution: 5x -3y = 13
4x - 3y = 11

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exam Other Question

can you help me with this problem? (x + 5)y + 2y Marla begins waling at 3 mi/h toward the library. Her friend meets her at the halfway point and drives her the rest of the way. The distance to the library is 4 mi. How many hours did marla walk?