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10?

Perfect. Now what's the formula for area of a triangle?

A = 1/2 base times height?

Right on. What's the distance between (7, 2) and (7, b) in terms of b?

And assuming b is positive.

I'm not sure, that's the part I don't get D: I don't know how to solve it.

yeah, that's what I tried to do.

mhmm, then?

One last thing. What's the base and the height of the triangle?

It's perpendicular?

Right.

|dw:1338696349644:dw|Can you tell me what the area of this triangle is?

5b - 10? ._. idk...

well, they gave it to us that the area is 45.

can i suggest another method?

Go ahead.

ohmigosh ._. what is that? ._.

sorry, but I don't think I learned that LOL

Back to the first way then.

LOL sorry, dpalnc :(

i don't know why but I got 9.4....

I don't know why either :P
You should get \[A=45=\frac{1}{2}\cdot10\cdot(b-2)=5\cdot(b-2)\]

Can you solve the equation \[45=5(b-2)\]for \(b\)?

yeahh so then that would become:
45 = 5b -10..
OH.
OKAY HOLD ON. I MADE A MISTAKE LOL

B = 11 !!!

Perfect. Great job.

You're welcome :)