4a + 6b = 10 2a - 4b equals 12 what does 12a equal

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03-01-2018
Mathematics

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4a + 6b = 10 2a - 4b equals 12 what does 12a equal

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Plz help I don’t understand

anchitthawi anchitthawi · Answer 1 · 2018-01-04T08:38:04+01:00

anchitthawi anchitthawi

04-01-2018

4a+6b=10 ----(1)
2a-4b=12 ----(2)
(2)*2; 4a-8b=24----(3)
(1)-(3); 6b-(-8b) = 10-24
14b = -14
so b = -1
then 2a-4(-1)=12
2a+4=12
2a = 8
so a = 4
then 12a = 12*4 = 48 #

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