Question

2x + 3y = 5
x - 2y =-1​

Answer 1

Răspuns:

2x + 3y = 5

x - 2y = -1 (×2)

2x + 3y = 5

2x - 4y = -2

7y = 7

y = 1

x - 2 = -1

x = -1 + 2

x = 1

Answer 2

Răspuns:

x=4.6

y= -1.4

Explicație pas cu pas:

2*x+3*y=5

x-2*y= -1

le scazi

2*x-x=x

3*y-2*y=y

5-(-1)=5+1=6

x-y=6

x=y+6

2*x+3*y=5

2*(y+6)+3*y=5

2*y+12+3*y=5

5*y=5-12

5*y= -7

y= -7/5

y= -1.4

x= -1.4+6

x=4.6