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Maths Puzzle
Numerical Ability
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To solve systems of equations by the substitution method. My son needs help with these 2 problems:
(1) x = 3y - 1
x +2y = 9
(2) 2x - 3y = 12
x = 4y +1
The sum of two numbers is 20. Twice one number is 4 more than four times the other. Find the numbers.