What is the area of the triangle whose vertices are x(−5, −1) , y(−5, −10) , and z(−9, −7) ? enter your answer in the box. units²

18 units²

Step-by-step explanation:

The "base" XY is the vertical line at x = -5. It is -1 -(-10) = 9 units long.

The "height" is the horizontal distance from the vertex at (-9, -7) to the vertical line at x=-5, so is -5-(-9) = 4 units. The area is ...

... A = (1/2)bh = (1/2)(9)(4) = 18 . . . . units²

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A diagram can be helpful.

Two because two of one thing is two.

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