Answer:
Step-by-step explanation:
If a + 3b = 7, subtract 3b from both sides of the equation
<u>-3b = -3b</u> 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
<u>+ 11b +11b</u>
21 = 8 + 11b subtract 8 from both sides
<u>-8 -8</u>
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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