Answer: AC=12 cm
Step-by-step explanation:
To solve this problem you must apply the law of sines, as you can see below:

Where:
a=13
A=85.2°
B=71.6°
Therefore, you must solve for b, then, you obtain that the lenght AC asked in the problem above is:

The formula of a slope:

We have the points A(-7, a) and B(c, d).
Substitute:

Exception: c ≠ -7.
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Step-by-step explanation:
[ Refer to the attachment ]
Answer:
x= −6−2y
Step-by-step explanation:
Subtract 2y from both sides of the equation x= −6−2y