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25-11-2020
Mathematics

contestada

Solve the simultaneous equations:

3a-2b=14
12a+9b=39

Respuesta :

meowmeow223334 meowmeow223334

25-11-2020

Use elimination
Multiply first equation by 4
12a - 8b = 56
12a + 9b = 39
Subtract both
-17b = 17
b = -1
Plug in -1 for b
3a - 2(-1) = 14
3a = 12, a = 4
Final answer: a = 4, b = -1

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