exam Maths Puzzle Numerical Ability

can you please help me solve by the addition-or-subtraction method: (((12a-5b=18 15a-5b=30)))

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exam Other Question

V= Bh; B Solve the following system of linear inequalities by graphing.
3x + 4y < 12
x + 3y < 6
x > 0
y > 0