Question

Rezolvati prin metoda reducerii :

d) 15x-20y=-34

12x+15y=-21


e)-8x+12y=0

6x-21y=-4


f)x-6y=16

-2x+9y=-23


g)x+2y=5

3x-4y=-25


h)3x-4y=18

2x+5y=-11


i)x-2(x+y)=3

y-3(x+y)=1

Answer 1

Răspuns:

d)1. 15x-20y=-34

x=-34/15+4y/3

2. 12x+15y=-21

y=- 4x/5-7/5

x=- 7/4

e) 1. -8x+12y=0

y=2x/3

x=0

2. 6x-21y=-4

y=2x/7+4/21

x=- 2/3

f)1. x-6y=16

2. -2x+9y=-23

g)1. x+2y=4

2. 3x-4y=-25

Explicație pas cu pas:

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