exam Maths Puzzle Numerical Ability

please help me solve this equation by substitution
y=2x+3
y=3x+1

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exam Other Question

express the following ratio having the same units in the numerator and denominator: 1 1/2 hours to 50 min. Which ratios are the largest in the sets: 3/5, 13/21, 17/30, 14/25, 11 find two numbers of which the sum is 11 and the difference is 5.