Bonjour,
a)
17x+15y=255
y=-x+16.5
17x+15(-x+16.5)=255
y=-x+16.5
17x-15x+247.5=255
y=-x+16.5
2x=255-247.5
y=-x+16.5
2x=7.5
y=-x+16.5
x=7.5/2=3.75
y=-3.75+16.5
x=3.75
y=12.75
b)
17x+15y=255
x+y=15.5
17x+15y=255
x=15.5-y
17(15.5-y)+15y=255
x=15.5-y
263.5-17y+15y=255
x=15.5-y
-2y=255-263.5
x=15.5-y
-2y=-8.5
x=15.5-y
y=-8.5/-2=4.25
x=15.5-4.25
y=4.25
x=11.25
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