given f : R (arrow sign) R , defined by f(x) = 2x-3 . if the ordered pairs (a,8) and (10,b) belongs to 'f' , find a and b.
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f(x)=2x-3
f(a)=8 [given]
2a-3=8
2a=5
a=2.5
f(10)=b
b=2×10-3
b=20-3
b=17
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