Question

Escrive v si la afirmacion es verdadera o falsa
-5x=10
x+y=-10

x+y=5
x=5+y

x+2y=3
x-y=0

Answer 1

-5x = 10
x+y=-10 //*5

-5x = -10
5x+5y=-50

0 +5y=-60
5y=-60
y=-12

x-12=-10
x=-10+12 = 2

2-12=-10 (V)
-5*2 = -10(F)
-------------------------------------------------------
x+y=5
x-y=5
2y=0
y=0
x+0=5
x=5

5+0=5 (v)
5=5+0
5=5 (V)
------------------------------------------------------
x +2y = 3
x-y=0

0+3y=3
y=1

x+2(1)=3
x+2=3
x=1

1+2(1) = 3
3=3 (v)
1-1=0 (v)