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rezolvati sistemul de ecuatii:2x+3y=7,3x-2y=-3

Răspuns :

2y=-3-3x
y=(-3-2x)/2
2x+3(-3-2x)/2=7
2x+(-9-6x)/2=7
2x-4.5-3x=7
-x=11,5
y=-13


2x+3y=7
3x-2y=-3

(2+3)(x+y)=7
(3-2)(x+y)=-3

5(x+y)=7
x+y=-3

x+y=7/5
x=-3/y

x-3/y=7/5
5xy-15y=7y
5xy=7y+15y
5xy=22y
5x=22y/y
5x=22
x=22/5
x=4intregi si 2/5
sper ca am fodt de folos


sau x= 4,4