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5430a<br />
⎧x−<br />
y− z = 0<br />
⎪<br />
⎨x+<br />
2y− 2z = 10<br />
⎪<br />
⎩2x+<br />
3y = 13<br />
(1) ⎧x<br />
= y+ z<br />
⎪<br />
(2) ⎨x+<br />
2y−2z− 10 = 0<br />
(3) ⎪<br />
⎩2x+<br />
3y− 13 = 0<br />
() 1 insättes i ( 2 ) och ( 3)<br />
⎧(<br />
y+ z) + 2y−2z− 10= 0<br />
⎨<br />
⎩2(<br />
y+ z) + 3y− 13 = 0<br />
⎧3y−<br />
z−<br />
10= 0<br />
⎨<br />
( lös själv)<br />
⎩5y+<br />
2z− 13= 0<br />
⎧y<br />
= 3<br />
⎨<br />
⎩z<br />
=−1<br />
y = 3 z = −1insättes<br />
i () 1<br />
x = 3 + ( − 1) = 2<br />
⎧x<br />
= 2<br />
⎪<br />
⎨y<br />
= 3<br />
⎪<br />
⎩z<br />
=−1<br />
LÖSNINGAR DEL B<br />
5430b<br />
⎧6x+<br />
2y− z = 7<br />
⎪<br />
⎨8x−<br />
y+ 5z = 30<br />
⎪<br />
⎩14x+<br />
3y− 4z = 3<br />
⎧−<br />
z = 7−6x−2y ( div − 1)<br />
⎪<br />
⎨8x−<br />
y+ 5z− 30 = 0<br />
⎪<br />
⎩14x+<br />
3y−4z− 3 = 0<br />
(1) ⎧z<br />
=− 7 + 6x+ 2 y<br />
⎪<br />
(2) ⎨8x−<br />
y+ 5z− 30 = 0<br />
(3) ⎪<br />
⎩14x+<br />
3y−4z− 3 = 0<br />
() 1 insättes i ( 2 ) och ( 3)<br />
⎧8x−<br />
y+ 5( − 7+ 6x+ 2 y)<br />
− 30= 0<br />
⎨<br />
⎩14x+<br />
3y−4( − 7 + 6x+ 2 y)<br />
− 3 = 0<br />
⎧8<br />
x− y+ ( − 35 + 30x+ 10 y)<br />
− 30 = 0<br />
⎨<br />
⎩14x+<br />
3 y−( − 28 + 24x+ 8 y)<br />
− 3 = 0<br />
⎧8x−<br />
y− 35+ 30x+ 10y− 30= 0<br />
⎨<br />
⎩14x+<br />
3y+ 28 −24x−8y− 3 = 0<br />
⎧38x+<br />
9y− 65 = 0<br />
⎨ ( lös själv)<br />
⎩−10x−<br />
5y+ 25 = 0<br />
⎧x<br />
= 1<br />
⎨<br />
⎩y<br />
= 3<br />
x = 1 y = 3 insättes i () 1<br />
z =− 7+ 6⋅ 1+ 2⋅ 3= 5<br />
⎧x<br />
= 1<br />
⎪<br />
⎨y<br />
= 3<br />
⎪<br />
⎩z<br />
= 5<br />
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