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david16
 4 years ago
Solve the system using elimination
3x + 3y = –9
3x – 3y = 21
a. (3, –6) b. (–5, 2) c. (3, 3) d. (2, –5)
david16
 4 years ago
Solve the system using elimination 3x + 3y = –9 3x – 3y = 21 a. (3, –6) b. (–5, 2) c. (3, 3) d. (2, –5)

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Tyler1992
 4 years ago
Best ResponseYou've already chosen the best response.4The answer is d. (2,5)

Tyler1992
 4 years ago
Best ResponseYou've already chosen the best response.4The y's cancel out leaving you with \[6x = 12\] Divide by 6 and x=2.. Plug in x =2 into any of the equations \[3(2) + 3y = 9\] Evaluate and solve for y \[6 + 3y = 9\] \[3y = 15\] \[y = 5\] Thus the answer is d.

thomashoang97
 4 years ago
Best ResponseYou've already chosen the best response.03x + 3y = 9 3x  3y = 21 ______________ Just add them, 6x + 0y = 12 6x = 12 x = 2 Now that you have x, which is 2, plug 2 back in one of the equations. 3(2) + 3y = 9 6 + 3y = 9 6 6 Subtract six from both sides. 3y = 15 y = 5 Now you have both x and y, just write them both as coordinates, (2,5)
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