exam Maths Puzzle Numerical Ability

Solve the system by graphing.
3x - y = 1
3x - y = 2

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exam Other Question

What is y+3y+8y+2 and I got to show my work. The chemical formula for sulfuric acid is h2so4. If the weight of the acid was 1470 grams, how much did the sulfur weight? (h : 1, s : 32, O 16)