dianewade15 dianewade15

03-02-2015
Mathematics

contestada

How do I solve x+4y=22
-x+5y=23

Respuesta :

03-02-2015

x+4y=22
-x+5y=23 (+)
9y=45
y=5

x+4*5=22
x=22-20
x=2

Answer Link

03-02-2015

{ x + 4y = 22 ( + x - x = 0 )
{ - x + 5y = 23

4y + 5y = 22 + 23
9y = 45
y = 45
9
y = 5

x + 4y = 22
x + 4 . 5 = 22
x + 20 = 22
x = 22 - 20
x = 2

S = { 2 , 5 }

Answer Link

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