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Sagot :
{3x+2y=4 /*5
{4x+5y=17 /*(-2)
{15x+10y=20
{-8x-10y=-34 (+)
7x=-14
x=-2
15x+10y=20
15*(-2)+10y=20
-30+10y=20
10y=50
y=5
{4x+5y=17 /*(-2)
{15x+10y=20
{-8x-10y=-34 (+)
7x=-14
x=-2
15x+10y=20
15*(-2)+10y=20
-30+10y=20
10y=50
y=5
[tex]3x+2y=4|\cdot(-4)\\
4x+5y=17|\cdot 3\\\\
-12x-8y=-16\\
\underline{12x+15y=51}\\
7y=35\\
y=5\\\\
3x+2\cdot5=4\\
3x+10=4\\
3x=-6\\
x=-2\\\\
\boxed{(x,y)=(-2,5)}[/tex]
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