add: 3x + 5y - 4; 9x + 4y and 2x - 5y + 7
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Answer: 14x + 4y + 3
Step-by-step explanation:
3x + 5y - 4 + 9x + 4y +2x - 5y + 7
= 3x + 9x + 2x + 5y + 4y - 5y - 4 + 7
= 14x + 4y - 4 + 7
= 14x + 4y + 3
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