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5431a<br />
⎧x+<br />
3y− z = 4<br />
⎪<br />
⎨2x+<br />
5y+ z = 15<br />
⎪<br />
⎩2x−<br />
10y+ 2z = −12<br />
(1) ⎧x<br />
= 4 − 3y+<br />
z<br />
⎪<br />
(2) ⎨2x+<br />
5y+ z−<br />
15 = 0<br />
(3) ⎪<br />
⎩2x−<br />
10y+ 2z+ 12 = 0<br />
() 1 insättes i ( 2 ) och ( 3)<br />
⎧2(4<br />
− 3 y+ z) + 5y+ z−<br />
15 = 0<br />
⎨<br />
⎩2(4<br />
− 3 y+ z) − 10y+ 2z+ 12 = 0<br />
⎧8−<br />
6y+ 2z+ 5y+ z−<br />
15= 0<br />
⎨<br />
⎩8−<br />
6y+ 2z− 10y+ 2z+ 12= 0<br />
⎧−<br />
y+ 3z− 7 = 0<br />
⎨ ( lös själv)<br />
⎩−<br />
16y+ 4z+ 20 = 0<br />
⎧y<br />
= 2<br />
⎨<br />
⎩z<br />
= 3<br />
y = 2 z = 3 insättes i () 1<br />
x = 4−3⋅ 2+ 3= 1<br />
⎧x<br />
= 1<br />
⎪<br />
⎨y<br />
= 2<br />
⎪<br />
⎩z<br />
= 3<br />
5446<br />
f( x) = kx+ m<br />
⎧ f (2) = 4<br />
⎪ x y ⎪⎧k⋅<br />
2+ m = 4<br />
⎨ ⇒ ⎨ ⇒<br />
⎪ f ( − 2) = 0<br />
⎪⎩ k⋅( − 2) + m = 0<br />
⎩ x y<br />
⎧2k<br />
+ m = 4<br />
⎨ ( lös själv)<br />
⎩−<br />
2k + m = 0<br />
⎧k<br />
= 1<br />
⎨ ⇒ f( x) = x+<br />
2<br />
⎩m<br />
= 2<br />
LÖSNINGAR DEL B<br />
5431b<br />
⎧a−<br />
4b+ c = −22<br />
⎪<br />
⎨a+<br />
4b+ 2c = −1<br />
⎪<br />
⎩a+<br />
3b+ 2c = −4<br />
(1) ⎧a<br />
= 4b−c−22 ⎪<br />
(2) ⎨a+<br />
4b+ 2c+ 1 = 0<br />
(3) ⎪<br />
⎩a+<br />
3b+ 2c+ 4 = 0<br />
() 1 insättes i ( 2 ) och ( 3)<br />
⎧(4b−c−<br />
22) + 4b+ 2c+ 1 = 0<br />
⎨<br />
⎩(4b−c−<br />
22) + 3b+ 2c+ 4 = 0<br />
⎧8b+<br />
c−<br />
21= 0<br />
⎨<br />
( lös själv)<br />
⎩7b+<br />
c−<br />
18= 0<br />
⎧b<br />
= 3<br />
⎨<br />
⎩c<br />
=−3<br />
b = 3 c = − 3 insättes<br />
i () 1<br />
a = 4⋅3−( −3) − 22= −7<br />
⎧a<br />
=−7<br />
⎪<br />
⎨b<br />
= 3<br />
⎪<br />
⎩c<br />
=−3<br />
5447<br />
f( x) = kx+ m<br />
⎧ f (2) = 3<br />
⎪ x y ⎧k⋅<br />
2+ m = 3<br />
⎨ ⇒ ⎨ ⇒<br />
⎪ f (3) = 2<br />
⎩k⋅<br />
3+ m = 2<br />
⎩ x y<br />
⎧2k<br />
+ m = 3<br />
⎨<br />
( lös själv)<br />
⎩3k<br />
+ m = 2<br />
⎧k<br />
=−1<br />
⎨ ⇒ f( x) = − x+<br />
5<br />
⎩m<br />
= 5<br />
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