If a + 2b = 55 and a — 2b = -13, fmd the value of b.
a + 2b = 55 ....(1)
a — 2b = -13....(2)
solving both the equations
a + 2b = 55
=> a = 55 - 2b ...(1)
put (1) in (2)
a — 2b = -13
( 55 - 2b) — 2b = -13
b = 17
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