Answer:

Step-by-step explanation:
For question #1:

For question #2:

7x and -7m
I think but I'm not exactly sure...
Since the score is 21 out of an unknown number, and the percantage is 70%, you set .7 equal to the score (21/x), and solve for x
.7 = 21/x
Multiply both sides by x
.7x = 21
Divide both sides by .7
x = 30
Answer:
Y= 2x+10
Step-by-step explanation:
(-2, 6), (-1, 8), (0, 10), (1, 12), (2, 14)
You add 2 every time