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Système d'équation
linaa
Created on May 12, 2022
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great
Droites du plan et systèmes d'équations
Jules et Lina
Start!
Rappels de cours:
RAPPELS DE COURS
équations cartésienne
Fonctions affines
système équations
positions relatives
équations réduite
corrections d'exos:
01
26 p.229
3)
+{( 5X3)x+ (7X3)y = -6X3 (-3X5)x + (-2X5)y =8X5 <=> +{ 15x+21y =-18 -15x - 10y = 40 On obtient et on resout l'équation : 0+ 11y =22 y= 22/11 =2 On substitue dans une des 2 équation la valeur trouvé : -3x(-2X2) = 8 x= -12/3 = -4
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02
27 p.229
3)
{ 1,5x + 4y = -1 1/3x - 2y =-6 <=> { 1,5x + 4y= -1 -2y= 1/3x<=> { 1,5x + 4y = -1 <=> { 1,5 x + 4(3+1/6) = y= 3+ 1/6x y=3+ 1/6x<=> { 12+2/3x + 3/2x=-1 <=>{ 4/6x + 9/6x = 12-1 y= 3+1/6x y= 3+ 1/6x <=> { 13/6x = -13 <=>{ x= -6 y= 3+1/6 X (-6) y= 3+(-1) <=> x=-6 y= 2 S={ (-6;2}
03
28 p.229
2)
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