Question

Solve the system using elimination.

3x + 3y = –9
3x – 3y = 21
A. (3, –6)

B. (–5, 2)

C. (3, 3)

D. (2, –5)

Answer 1

add to eliminate y
solve for x
then replace this value of x in the forst equation to find y

Answer 2

add the 2 equations to eliminate y

3x + 3y = -9
3x - 3y = 21
------------
6x = 12

x = 2

substitute in either equation to find

y = -5

ordered pair is (2, -5)

Answer 3

so the answer is D right

Answer 4

yes

Answer 5

thanks can you help me with another one?