Question

Să se rezolve sistemele de ecuații:
a)2x+3y=5
x-2y=-1
b)x+2y=1
3x+y=-2
c)4x-y=-7
x+2y=5
Ajutor ♡

Answer 1

a) 2*x+3*y=5

x-2*y=-1

2*(2*y-1)+3*y=5

x=2*y-1

4*y-2+3*y=5

x=2*y-1

7*y=7

x=2*y-1

y=1

x=2*1-1

y=1

x=1

b) x+2*y=1

3*x+y=-2

x=1-2*y

3*(1-2*y)+y=-2

x=1-2*y

3-6*y+y=-2

x=1-2*y

-5y=-5

x=1-2*y

y=1

x=1-2*1

y=1

x=-1

y=1

c) 4*x-y=-7

x+2*y=5

4*(5-2*y)-y=-7

x=5-2*y

20-8*y-y=-7

x=5-2*y

-9*y=-27

x=5-2*y

y=3

x=5-2*3

y=3

x=5-6

y=3

x=-1