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10.b - Jöfnuhneppi (Leyst með grafi)
Contributed by: Sverrisson
(Original author: Jarvie)
2
-2
4
-4
6
-6
2
-2
4
-4
6
-6
8
-8
10
-10

Lausn jafnanna er þar sem línurnar skerast.
Finndu lausnina?
(-4, -2)
(-4, 2)
(-2, -4)
Engin lausn
2
-2
4
-4
6
-6
2
-2
4
-4
6
-6
8
-8
10
-10
Hver er lausnin?
(2, 4)
(0, 4)
Engin lausn
(1, 4)
2
-2
4
-4
6
-6
2
-2
4
-4
6
-6
8
-8
10
-10
Hver er lausnin?
(-2, 5)
(5, -2) 
(4, -2)
Engin lausn
2
-2
4
-4
6
-6
2
-2
4
-4
6
-6
8
-8
10
-10
Hver er lausnin?
(0, -3)
(-3, 1)
(-3, 0)
Engin lausn
2
-2
4
-4
6
-6
2
-2
4
-4
6
-6
8
-8
10
-10
Finndu lausnina?
(3, 1)
(-2 -2)
Óendanlega margar
Engin lausn
2
-2
4
-4
6
-6
2
-2
4
-4
6
-6
8
-8
10
-10
Finndu lausnina?
(0, 3)
(0, 2)
Óendanlega margar
Engin lausn
Er (3, 4) lausn jafnanna
{
y = x + 1
y = -2x + 2
?
Nei
Er (-4, 1) lausn jafnanna
{
x + 5y = 1
y = 1/2x + 3
?
Nei
Er (-2, -5) lausn jafnanna
{
-2x - y = 9
y = x - 3
?
Nei
Er (0, -3) lausn jafnanna
{
2x + y = -6
y = x - 3
?
Nei
2
-2
4
-4
6
-6
2
-2
4
-4
6
-6
8
-8
10
-10
Hvaða jöfnur eiga lausnina (6, 0)?
a
b
a
b
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