21-05-2020
Mathematics

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If 2a=3b and 4a+b=21, then b =

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wegnerkolmp2741o wegnerkolmp2741o

21-05-2020

Answer:

b=3

Step-by-step explanation:

2a=3b and 4a+b=21,

Multiply the first equation by 2

2(2a) = 2*3b

4a = 6b

Substitute this into the second equation

4a+b = 21

Replace 4a with 6b

6b+b = 21

Combine like terms

7b = 21

Divide each side by 7

7b/7 = 21/7

b = 3

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