Question

Помогите решить

35b+165b b=450
307a-207a a=68

8y+2y=400
8a-a=637

Answer 1

35×450+165×450=90000
307×68-207×68=34952


8y+2y=400
10y=400
y=400/10
y=40
8×40+2×40=400



8a-a=637
8a-1a=637
7a=637
a=637/7
a=91
8×91-91=637