Respuesta :

#A

[tex]\\ \bull\tt\dashrightarrow 3x+7=4x-5[/tex]

[tex]\\ \bull\tt\dashrightarrow 4x-3x=7+5[/tex]

[tex]\\ \bull\tt\dashrightarrow x=12[/tex]

Now

[tex]\\ \bull\tt\dashrightarrow m<BAD=3x+7=3(12)+7=36+7=43[/tex]

#B

[tex]\\ \bull\tt\dashrightarrow y+4=5y-4[/tex]

[tex]\\ \bull\tt\dashrightarrow 5y-y=4+4[/tex]

[tex]\\ \bull\tt\dashrightarrow 4y=8[/tex]

[tex]\\ \bull\tt\dashrightarrow y=2[/tex]

Now

[tex]\\ \bull\tt\dashrightarrow BC=y+4+5y-4[/tex]

[tex]\\ \bull\tt\dashrightarrow BC=6y[/tex]

  • Put value

[tex]\\ \bull\tt\dashrightarrow BC=6(2)=12[/tex]

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