exam Maths Puzzle Numerical Ability

Solve the system by substitution.
x+y=12
y=2x

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exam Other Question

1) A computer store has 10 copies of a word processing program, 12 copies of a spread sheet program, and 8 copies of a draw program. Three of the word processing, four of the sprea Solve by substitution or elimination method:
1. 3x - 2y = 8
-12x + 88 = 32

2. 7x - 5y = 14
-4x + y = 27

3. -4x + 3y = 5
12x - 9y = -15