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edjiejwi
22.07.2020 •
Mathematics
I'm marking answers as brainliest. The solution to the following system is ________. -9x + 6y = -30, -7x + 12y = -16 * I I (0,2) (4,1) (-4,7) (2,1)
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Ответ:
Step-by-step explanation:
-9x + 6y = -30
-7x + 12y = -16
18x - 12y = 60
-7x + 12y = -16
11x = 44
x = 4
-36 + 6y = -30
6y = 6
y = 1
(4,1)
Ответ:
(4,1)
Step-by-step explanation:
-9x + 6y = -30(1)
-7x + 12y = -16 (2)
(2) - 2(1)
-7x+12y - 2(-9x+6y) = -16 - 2(-30)
simplify
11x = 44
or
x = 4 (3a)
substitute (3) in (1)
-9(4) + 6y = -30
6y = -30 + 36
6y = 6
y = 1 (3b)
Using results from (3a) and (3b), we have
solution : (4,1)
Ответ:
A
Step-by-step explanation:
1-0.045=0.955