Question

ajutor urgent vă rog​

Answer 1

Răspuns:

a)

|4x-y= -1

|2x+y= 13

2x= 12 \ ÷2

x=6

2×6+y= 13

12+y= 13 \-12

y=1

(6;1)

b)

|x+y= 4

|3x+y=6 | × -1

|x+y=4

|-3x-y=-6

-2x=-2 | ÷(-2)

x=1

1+y=4 \ -1

y= 3

(1;3)

c)

|x-y= -5

|-x+3y= 19

2y=14 /÷2

y=7

x-7=-5 /+7

x= 2

(2;7)

d)

|3x+2y=19

|x+5y=15 / × (-3)

|3x+2y=19

|-3x-15=-45

-13y=-26 / ÷ (-13)

y=2

x+5×2=15

x+10=15 /-10

x= 5

(5;2)