B ( x ) = 18 − 0.5 x x = − 2 → B ( − 2 ) = 18 − 0.5 × ( − 2 ) = 18 + 1 = 19 x = 0 → B ( 0 ) = 18 − 0.5 × 0 = 18 x = 5 → B ( 5 ) = 18 − 0.5 × 5 = 18 − 2.5 = 15.5
To solve B ( x ) = 18 − 0.5 x for given values of x , substitute each value into the equation. The results are B ( − 2 ) = 19 , B ( 0 ) = 18 , and B ( 5 ) = 15.5 .
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