Question

Vă rog frumos dau coroană

Answer 1

a. x+2y= -1

4x-2y=6

se aduna cele doua si se reduce 2y cu -2y

ramane: x+4x= -1+6

5x=5

x=5:5

x=1

x+2y= -1

2y= -1-x

2y= -1-1

2y= -2

y= -2:2

y= -1

b) 3x+4y=6

x-4y=-14

la fel se adun si se reduce 4y cu -4y

ramane: 3x+x=6-14

4x= -8

x= -8:4

x= -2

x-4y=-14

x+14=4y

-2+14=4y

4y=12

y=12:4

y=3