exam Maths Puzzle Numerical Ability

Graph the inequality: x - y >= 2

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exam Other Question

four hot dogs and soft drink costs $6.30, whereas one hot dog and four soft drinks cost $4.20. What is the total cost of one hot dog and one soft drink X + 2Y + Z = 1
2X - Y + 2Z = 2
3X + y + 3z = 3