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Write down both equations (I'll label them (1) and (2)):
(1) a = 3b - 4
(2) a + b = 16
Pass b to the left side of the equation (1):
(1) a - 3b = -4
(2) a + b = 16
Multiply (1) by -1:
(1) -a + 3b = 4
(2) a + b = 16
Add down both equations:
-a + 3b + a + b = 4 + 16
4b = 20
b = 5
Replace b in (2):
a + 5 = 16
a = 11
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