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Jeffrey Deleon
Mathematics
9 March, 18:37
If 3a-2b=8 and a+3b=7 what is the value of 4a+b
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Avery Curtis
9 March, 18:51
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Step-by-step explanation:
If a + 3b = 7, subtract 3b from both sides of the equation
-3b = - 3b then you get
a = 7-3b now plug this into the other equation: 3a-2b=8
3 (7-3b) - 2b = 8
21 - 9b - 2b = 8
21 - 11b = 8 add 11 b to both sides
+ 11b + 11b
21 = 8 + 11b subtract 8 from both sides
-8 - 8
13 = 11b
What is 4a+b?
4 (7-3b) + b =
(28 - 12b) + b =
28-11b (from above 13=11b)
28 - 13 = 15
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