Question

a-5b=7
afla pe x din relațiile:
x-2a+10b+17=4
47-x+7a-35b=2a-10b+4
dau coroana!!

Answer 1

x-2a+10b+17=4  

x - 2 (a - 5b) + 17 = 4

x  - 2 × 7 + 17 = 4

x - 14 + 17 = 4

x + 3 = 4

x = 4 - 3

x = 1

47-x+7a-35b=2a-10b+4

47 - x + 7 (a - 5b) = 2 ( a - 5b) + 4

47 - x + 7 × 7 = 2 × 7 + 4

47 - x + 49 = 14 + 4

47 - x = 28 - 49

47 - x = - 21

x = 47 - (-21)

x = 68