Question

Exercitiul 5 repede dau 35 puncte si coroana

Answer 1

Explicație pas cu pas:

a) -x=7+y

x=-y-7

y-7+3y=-9

4y=-2

y=-1/2

x=-1/2-7=-15/2

b)y=-8-2x

-3x+4(-8-2x)=23

-3x-32-8x=23

-5x=23+32

-5x=55

x=-11

y=-8+22=14

c)-y=-15-7x

y=15+7x

-3x+15+7x=7

4x=-8

x=-2

y=15+7×(-2)=15-14=1

d)x=y

-4x+5x=3

x=3

y=3