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Fungsi linear berikut yang grafiknya memotong sumbu X adalah ….

Fungsi linear berikut yang grafiknya memotong sumbu X adalah ….

A. begin mathsize 14px style f left parenthesis x right parenthesis equals negative 2 x plus 4 end style dengan begin mathsize 14px style D subscript f equals left curly bracket x vertical line x less or equal than 1 comma x element of R right curly bracket end style
B. begin mathsize 14px style f left parenthesis x right parenthesis equals negative 2 x minus 6 end style dengan begin mathsize 14px style D subscript f equals left curly bracket x vertical line x less or equal than negative 2 comma space x element of R right curly bracket end style
C. begin mathsize 14px style f left parenthesis x right parenthesis equals 2 x minus 8 end style dengan begin mathsize 14px style D subscript f equals left curly bracket x vertical line x less or equal than 2 comma space x element of R right curly bracket end style
D. begin mathsize 14px style f left parenthesis x right parenthesis equals 3 x plus 6 end style dengan begin mathsize 14px style D subscript f equals left curly bracket x vertical line greater or equal than 1 comma space x element of R right curly bracket end style
E. begin mathsize 14px style f left parenthesis x right parenthesis equals 3 x minus 6 end style dengan undefined

Pembahasan

Memotong sumbu begin mathsize 14px style X end style saat begin mathsize 14px style y equals 0 end style.

Karena

table attributes columnalign right center left columnspacing 0px end attributes row cell f left parenthesis x right parenthesis end cell equals cell negative 2 x minus 6 end cell row y equals cell negative 2 x minus 6 end cell row 0 equals cell negative 2 x minus 6 end cell row cell 2 x end cell equals cell negative 6 end cell row x equals cell negative 3 less or equal than negative 2 end cell end table

karena domainnya adalah D subscript f equals open curly brackets x less or equal than negative 2 comma x element of straight real numbers close curly brackets ,maka,

Jawaban yang tepat adalah B.

 

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