Solve the system using elimination. 3x + 3y = –9 3x – 3y = 21
1 answer:
Answer:
y=-5,x=2
Step-by-step explanation:
3x+3y=-9________________eqn 1
3x-3y=21________________eqn 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
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Answer:
x=4
Step-by-step explanation:
3x-3=9
+3=+3
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divide both sides by 3
leaving x by itself
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Answer:
see bottom
Step-by-step explanation:
divide through by 4
x2 - 2x - 3 = 0
x2 - 3x + x - 3 = 0
(x2 - 3x) + (x - 3) = 0
x(x - 3) + 1(x - 3) = 0
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x + 1 = 0 and x - 3 = 0
x = -1 and x = 3
Answer:
Mean Absolute Deviation (MAD): 1.6
