Question

решите уравнения 9x-4x+39=94, 7y+2y-34=83

Answer 1

9x-4x+39=94
5x=94-39
5x=55
x=55/5
x=11
9x11-4x11+39=94
94=94

7y+2y-34=83
9y-34=83
9y=83+34
9y=117
y=117:9
y=13
7x13+2x13-34=83
83=83