Question

Please explain this well i don't understand (55 points)

Answer 1

B

Explanation:

the area of a triangle is

`A=(1)/(2)(h)(b)`

so if we take as

`from\:(x_1,y_1)\rightarrow(x_2,y_1)`

so the base is

`b=x_2-x_1`

so the height is

`from\:b\rightarrow(0,0)`

the distance is

`h=y_1-0`

so the area is

`A=(1)/(2)(y_1+0)(x_2-x_1)\\\\=(1)/(2)(y_1)(x_2-x_1)`

so the answer is B