You are using an angle and proportional side lengths.
SAS Similarity
Answer:
The slope of a line is a number that defines the direction + steepness of a linear function. It can be found using the formula rise/run.
Step-by-step explanation:
Not sure how to explain this otherwise but that is what the slope is. ^
Answer: b=-12
Step-by-step explanation:
120/-10 = -12
-10b/-10 = b
b=-12