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How do you solve b equals 2a plus 11 and a plus b equals 5 by substitution?
Wiki User
∙ 12y ago
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
Wiki User
∙ 12y ago
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