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Answer:
63/5
Step-by-step explanation:
when x = 8 and y = 6
the two equations become
8 = 1/10 * 6 + a & 6 = 1/10 * 8 + b
which simplify to
8 = 3/5 + a & 6 = 4/5 + b
so a = 8 - 3/5 = 37/5 & b = 6 - 4/5 = 26/5
a + b = 37/5 + 26/5 = 63/5