What is the sum of 2x – 3y + 15 and -7x + 12y – 57?
a. 5x + 9y -42 b. -5x + 9y – 42
c. 5x – 9y – 42 d. -5x – 9y – 42
a. 5x + 9y -42 b. -5x + 9y – 42
c. 5x – 9y – 42 d. -5x – 9y – 42
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Answer:
b. -5x + 9y - 42
Step-by-step explanation:
(2x - 3y + 15) + (-7x + 12y - 57)
= -5x - 3y + 15 + 12y - 57
= -5x + 9y + 15 - 57
= -5x + 9y - 42
Therefore the correct answer is b. -5x + 9y - 42
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