In 3 years, a gym membership went up from 6,400 to 8,400. write an expression that shows how to find the percent of increase. then find the percent of increase.

Step-by-step explanation:

Percent change is found using the formula ...

  percent change = ((new value) - (old value))/(old value) × 100%

This can be divided out to be ...

  percent change = ((new value)/(old value) -1) × 100%

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For your numbers, the change is ...

  percent change = (8400 -6400)/6400 × 100% = 31.25%

6, 10

9, -13

12, -21

18, -23

step-by-step explanation:

you just add 6 to the x-coordinate and subtract 10 from the y-coordinate.