Question

8х+14=878

5у-у=68

Answer 1

8х+14=878

8х=878-14

8х=864

х=864:8

х=108

 

5у-у=68

4у=68

у=68:4

у=17

Answer 2

8х+14=878

8x=878-14

8x=864

x=864:8

х=108                

8·108+14=878 (это проверка)

864+14=878

878=878

 

5у-у=68

4у=68

у=68:4

у=17                  

5·17-17=68

85-17=68

68=68