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Sylvie1999
@Sylvie1999
April 2019
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Résoudre par substitution:
x - 3y = - 5
7x + 8y = 19
Svp merci :)
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slyz007
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X-3y=-5 donc x=3y-5
7x+8y=19
7x+8y=7(3y-5)+8y=21y-35+8y=19
29y=54
y=54/29
x=3*54/29-5=(162-145)/29=17/29
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Verified answer
X-3y=-5 donc x=3y-57x+8y=19
7x+8y=7(3y-5)+8y=21y-35+8y=19
29y=54
y=54/29
x=3*54/29-5=(162-145)/29=17/29