#1.
Here what you do is cross multiply.

#2.
Same as #1, just cross multiply.

You get the gist?
Answer:
The slope is undefined.
Step-by-step explanation:
A slope of zero would be a horizontal line, this is a vertical line, which would mean it's undefined.
Answer:
420
Step-by-step explanation:
brainliest?
Answer:
a) 4, b) 10
Step-by-step explanation:
a)
1) - 7 + 3 = - 4
2) | - 4| = 4
b)
1) |- 7| = 7
2) 7+3 = 10
Answer:
7
Step-by-step explanation:
7 x 3 = 21