Question

NEED HELP IN NUMBER 12 and 13 PLEASEEEE

Answer 1

Answer:

12.) b = (2S/n) - a

13.) x = 1000 - 20y

Step-by-step explanation:

12.) *goal is to isolate b

S = n/2 (a + b)

S(2/n) = a + b

**multiply both sides by 2/n to get rid of n/2

(2S/n) - a= b

***subtract a from both sides to leave b alone on one side

13.) *goal is to isolate x

0.30x + 6y = 300

0.30x = 300 - 6y

** subtract 6y from both sides

x = (300 - 6y)/ 0.30

*** divide 0.30 from both sides to leave x bu itself

x = 1000 - 20y or -20y +1000

****300 ÷ 0.30 = 1000

-6 ÷ 0.30 = -20

Done!