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stepladder [879]
3 years ago
14

Solve, using linear combination. 3x + y = 4. 2x + y = 5. A.. . . (–1, 7). . . B.. . . (–3, 12). . . C.. (0, 4). . . D.. . . (–3,

13).
Mathematics
2 answers:
Nady [450]3 years ago
8 0
3x + y = 4....multiply by -1
2x + y = 5
--------------
-3x - y = -4 (result of multiplying by -1)
2x + y = 5
--------------add
-x = 1
x = -1

2x + y = 5
2(-1) + y = 5
-2 + y = 5
y = 5 + 2
y = 7

solution is (-1,7)
Kisachek [45]3 years ago
5 0
3x + y = 4
2x + y = 5
-3x - y = -4 
2x + y = 5
-x = 1
x = -1
2x + y = 5
2(-1) + y = 5
-2 + y = 5
y = 5 + 2
y = 7

solution is (-1,7) hope this helps 
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Using chi^2 = Sum[(O - E)^2/E],          

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