Răspuns :
a)7x-4y=-19
7x-4•3= -19
7x-12= -19
7x= -19+12
7x= -7
x= -7/7
x= -1
b)10x+6y=-2
10x+6•3= -2
10x+18= -2
10x= -2-18
10x= -20
x= -20/10
x= -2
Răspuns:
7x-18=-19 ;7x=-19+18 ; 7x=-1 ; x=-1/7 ; b) 10x+18=-2 ; 10x=-2-18 ; 10x=-20 ; x=-20/10=-2
Explicație pas cu pas: