B = 11 - a
Add 'a' to each side:
B + a = 11
Subtract 'B' from each side:
a = 11 - B
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9a + 3b - 11a - 4b = -2a -b
11a+9 = 4a+30 11a-4a = 30-9 7a = 21 Solution: a = 3
11a-3a =8a so 8a+9=-7 8a = -16 a=-2
b = 2a + 11a + b = 5 which is b = 5 - atherefore2a + 11 = 5 - a (which is b = b)2a + a = - 11 + 53a = - 6a = - 2looking at first equation substitute - 2 for a:b = 2a + 11b = 2*(- 2) + 11b = - 4 +11b = 7to check:a + b = 5- 2 + 7 = 5
A=4. Divide both sides by 11 and a=4