Given that 4x - 5y = 12 find y when x= -3

4x -5y = 12. 5y =4x -12. y = (4/5) x -12/5

Step-by-step explanation:

Explanation:

4x - 5y = 12

x = -3

4(-3) - 5y = 12

-4 · 3 - 5y = 12

-12 - 5y = 12

-12 - 5y + 12 = 12 + 2

-5y = 24

-5y / -5 = 24 / -5

y = ⁻²⁴⁄₅

y = -4.8

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.

answer: 5 17/33 % (to the tenth)

step-by-step explanation:

he guessed: 34.5 pounds

actual weight is 32.7

there for he is off:

34.5 -32.7 = 1.8

32.7 is the 100%

1.8 represents %? of 32.7

therefore:

32.7   - 100%

1.8     -     x%

x= 1.8*100%/32.7% = 18*100%/327%

x=1800%/327%   = (5 165/327)%

to the tenth:

5 17/33 %