Respuesta :

[tex]\\ \ast\sf\hookrightarrow AB+BC=AC[/tex]

[tex]\\ \ast\sf\hookrightarrow 3x+1+2x=21[/tex]

[tex]\\ \ast\sf\hookrightarrow 5x+1=21[/tex]

[tex]\\ \ast\sf\hookrightarrow 5x=21-1[/tex]

[tex]\\ \ast\sf\hookrightarrow 5x=20[/tex]

[tex]\\ \ast\sf\hookrightarrow x=\dfrac{20}{5}[/tex]

[tex]\\ \ast\sf\hookrightarrow x=4[/tex]

Ver imagen Аноним
Happil

Answer:

[tex]x = 4[/tex]

Step-by-step explanation:

[tex]AB + BC = AC \\ (3x +1) +(2x) = 21 \\ 3x +1 +2x = 21 \\ (3 +2)x +1 = 21 \\ 5x +1 = 21 \\ 5x +1 -1 = 21 -1 \\ 5x = 20 \\ \frac{5x}{5} = \frac{20}{5} \\ x = 4[/tex]

Otras preguntas