karena13aguirre
24.06.2020 •
Mathematics
Solve the system using elimination. 3x + 3y = –9 3x – 3y = 21
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Ответ:
y=-5,x=2
Step-by-step explanation:
3x+3y=-9eqn 1
3x-3y=21eqn 2
using elimination method
3x+3y=-9
-
3x-3y=21
subtract equation 2 from equation 1
0+6y=-30
6y=-30
y=-30/6
y=-5
substitute the value of y in equation 1
3x+3y=-9
3x+3(-5)=-9
3x-15=-9
3x=-9+15
3x=6
x=6/3
x=2
Ответ:
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