(20 - 3x) + (40+5y) = 100

Question

(20 - 3x) + (40+5y) = 100

Answer 1

(20-3х)+(40+5у)=100
20-3х+40+5у=100
-3х+5у=100-20-40
2ху=40
ху=40:2
ху=20

Answer 2

20 - 3х + 40 + 5у = 100
5у - 3х = 40
3х = 40 - 5у
20 - 40 + 5y + 40 + 5y = 100
20 + 10y = 100
10y = 80
y = 8
3x = 40 - 5*8
3x = 40 - 40
3x = 0
x = 0



Ответ: y = 8
            x = 0