8-4 Percent Increase and Decreay Find each percent Increase or decrease to the nearest percent.
1. from 16 to 20
2. from 30 to 24
3. from 15 to 30
6. from 45 to 63
5. from 40 to 46
4. from 35 to 21
9. from 90 to 72
8. from 24.5 to 21.56
7. from 18 to 26.1
12. from 38 to 33
11. from 42 to 92.4
10. trorn 29 to 54
15. from 89 to 32.9
14. from 78 to 136.5
13. from 64 to 36.4

divide each number and conver into percentage

Step-by-step explanation:

Divide the second number by the first one and then minus 1 from the answer that would be the decimal answer multiply it into 100 to get the percentage answer. Example: 20/16 =1.25  

1.25-1= 0.25,

0.25 x100 = 25% increase

repeat this process for all, keep in mind it can also be decrease

5x + 3y = - 4

step-by-step explanation:

the equation of a line in standard form is

ax + by = c ( a is a positive integer and b, c are integers )

express the line first of all in slope- intercept form

y = mx + c ( m is the slope and c the y-intercept )

to calculate m use the gradient formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (7, - 3) and (x₂, y₂ ) = (4, - 8)

m = = -

y = - x + c ← is the partial equation

to find c substitute either of the 2 points into the partial equation

using (4, - 8 ), then

- 8 = - + c ⇒ c = -

y = - x - ← in slope-intercept form

multiply all terms by 3 to eliminate the fractions

3y = - 5x - 4 ( add 5x to both sides )

5x + 3y = - 4 ← in standard form