Respuesta :

Answer:

B

Step-by-step explanation:

the area of a triangle is

[tex]A=\frac{1}{2}(h)(b)[/tex]

so if we take as

[tex]from\:(x_1,y_1)\rightarrow(x_2,y_1)[/tex]

so the base is

[tex]b=x_2-x_1[/tex]

so the height is

[tex]from\:b\rightarrow(0,0)[/tex]

the distance is

[tex]h=y_1-0[/tex]

so the area is

[tex]A=\frac{1}{2}(y_1+0)(x_2-x_1)\\\\=\frac{1}{2}(y_1)(x_2-x_1)[/tex]

so the answer is B

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