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Stiind ca 3x +2y +1 = 18 si 2x +2y =13 determinaty x .
determinati => aflati
Dau coroana !!


Răspuns :

3x+2y+1=18
2x+2y=13
3x+2y+1-2x-2y=18-13
x+1=5
x=5-1
x=4
3*4+2y+1=18
12+2y+1=18
13+2y=18
2y=18-13
2y=5
y=5:2=2,5
v:3*4+2*2,5+1=18
v:2*4+2*2,5=13