Question

1/ 4(7х-20) - 1 /2(3у-10) х=2 2/7 , у=8​

Answer 1

Ответ:

Пошаговое объяснение:

1/ 4 (7х-20) - 1 /2 (3у-10)  при х=2 2/7 , у=8​

7/4х-5 -3/2у+5= 7/4х-3/2у= 7/4*2 2/7- 3/2*8= 4-12= -8

Answer 2

To solve this expression, substitute the given values of x and y into the equation and simplify:

1. Substitute x = 2 2/7 and y = 8 into the expression:

   (1/4)(7x - 20) - (1/2)(3y - 10)

   (1/4)[7(2 2/7) - 20] - (1/2)[3(8) - 10]

2. Simplify each part of the expression:

   (1/4)[14/7 - 20] - (1/2)[24 - 10]

3. Continue simplifying:

   (1/4)[2/7 - 20] - (1/2)[14]

4. Further simplify:

   (1/4)[-138/7] - 7

5. Multiply the fractions:

   (-138/28) - 7

6. Find a common denominator:

   (-138/28) - (7 * 28/28)

7. Subtract the fractions:

   (-138/28) - (196/28)

8. Combine the fractions:

   (-138 - 196)/28

9. Add the numerators:

   (-334)/28

10. Simplify the fraction:

-167/14

So, the value of the expression when x = 2 2/7 and y = 8 is -167/14.