Given f : R -> R as f( x )= 3x+4. If ordered pairs ( a , 8) and (2, b) belongs to 'f' .Find a and b.
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f(x) is the value of y in the ordered pair
in the first ordered pair (a, 8), x = a , y = 8
3x + 4 = 8
=> 3x = 8 - 4 = 4
=> x = 4/3
=> as x = a value of a = 4/3 Answer 1
similarity, in the 2nd pair of (2, b ), x = a= 2 , y = b
y = f(x) = 3x + 4
=> y = 3×(4/3) +4
=> y = 4 + 4 = 8 = b
therefore a = 4/3 and b= 8
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