book Maths Puzzle Numerical Ability

solve using substitution
2x + y = 4
3x + 2y = 1

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book Other Question

5. The width of a rectangle is 15 feet less than its length, and the perimeter is 210 feet. Find the width:
a. 60 feet b. 35 feet c. 45 feet d. 40 feet e. none Why, in a linear equation do you always solve for y?