If 2x - 3y = 7 and 4x + y = 21, what is the value of x + y?
✓ Correct Answer: Option B
Multiply the second equation by 3 to get 12x + 3y = 63. Add this to the first equation (2x - 3y = 7) to eliminate y, resulting in 14x = 70, so x = 5. Substitute x=5 into 4x + y = 21 to find y=1. Thus, x + y = 5 + 1 = 6.
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