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Sagot :

a) x+5y=17
3x+2y=25

x=17-5y
3(17-5y)+2y=25
51-15y+2y=25
-13y=-26
y=2
x=17-5*2=7

b) 2x-7y=13
3x+2y=7

3(2x-7y)-2(3x+2y)=3*13-2*7
6x-21y-6x-4y=39-14
-25y=25
y=-1
3x=7-2*(-1)=7+2=9
x=3

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