exam Maths Puzzle Numerical Ability

Please help with this problem

Solve the system by addition method:

Eq 1 states 3x = 3 + 2y
Eq 2 states -4/3x + y = 1/3

Please show work

Thank you

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exam Other Question

Write a mathematical argument that two lines perpendicular to the same line are parallel to each other. i need help solving this equation

|-15+9| (absolute value)
im guessing the correct answer would be 6 but wanted to make sure