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Sagot :
[tex]5\cdot20-2\cdot15=70\\
100-30=70\\
70=70\leftarrow \text{ true}\\\\
3\cdot20+4\cdot15=120\\
60+60=120\\
120=120\leftarrow \text{ true}[/tex]
{5x-2y=70 /*2
{3x+4y=120
___________________
{10x-4y=140
{3x+4y=120 (+)
13x=260 /:13
x=20
3x+4y=120
3*20+4y=120
4y=120-60
4y=60 /:4
y=15
So the solution is (20; 15)
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