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b = 2a + 11

a + b = 5 which is b = 5 - a

therefore

2a + 11 = 5 - a (which is b = b)

2a + a = - 11 + 5

3a = - 6

a = - 2

looking at first equation substitute - 2 for a:

b = 2a + 11

b = 2*(- 2) + 11

b = - 4 +11

b = 7

to check:

a + b = 5

- 2 + 7 = 5

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Q: How do you solve b equals 2a plus 11 and a plus b equals 5 by substitution?
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