Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
5407a<br />
⎧4x−<br />
3z = 6<br />
⎨<br />
⎩z<br />
− 8= 0<br />
(1) ⎧4x−3z−<br />
6 = 0<br />
⎨<br />
(2) ⎩z<br />
= 8<br />
( 2 ) insättes i ( 1)<br />
4x−3⋅8− 6= 0<br />
( lös själv)<br />
x = 7,5<br />
⎧x<br />
= 7,5<br />
⎨<br />
⎩z<br />
= 8<br />
5409a<br />
(1) ⎧x<br />
= 4<br />
⎨<br />
(2) ⎩y<br />
= 3x−8 () 1 insättes i ( 2)<br />
y = 34 ⋅ −8<br />
y = 4<br />
⎧x<br />
= 4<br />
⎨<br />
⎩y<br />
= 4<br />
(4,4)<br />
LÖSNINGAR DEL B<br />
5407b<br />
⎧y<br />
= x+<br />
1<br />
⎨<br />
⎩5x−<br />
2y = 10<br />
(1) ⎧y<br />
= x+<br />
1<br />
⎨<br />
(2) ⎩5x−2y−<br />
10 = 0<br />
() 1 insättes i ( 2)<br />
5x− 2( x+<br />
1) − 10= 0<br />
( lös själv)<br />
x = 4<br />
x = 4 insättes i 1<br />
y = 4+ 1= 5<br />
⎧x<br />
= 4<br />
⎨<br />
⎩y<br />
= 5<br />
()<br />
5409b<br />
⎧y<br />
− 5= 0<br />
⎨<br />
⎩x−<br />
3y+ 11= 0<br />
(1) ⎧y<br />
= 5<br />
⎨<br />
(2) ⎩x−<br />
3y+ 11 = 0<br />
() 1 insättes i ( 2)<br />
x −3⋅ 5 + 11 = 0<br />
( lös själv)<br />
x = 4<br />
⎧x<br />
= 4<br />
⎨<br />
⎩y<br />
= 5<br />
(4,5)<br />
5408a<br />
⎧4u−<br />
v+<br />
7= 0<br />
⎨<br />
⎩2u+<br />
3v+ 7= 0<br />
⎧−<br />
v=−4u−7 ⎨<br />
⎩2u+<br />
3v+ 7= 0<br />
(1) ⎧v=<br />
4u+ 7<br />
⎨<br />
(2) ⎩2u+<br />
3v+ 7 = 0<br />
() 1 insättes i ( 2)<br />
( div − 1)<br />
2u+ 3(4u+ 7) + 7= 0<br />
u =−2<br />
u =−2insättes<br />
i () 1<br />
v = 4⋅( − 2) + 7=−1 ⎧u<br />
=−2<br />
⎨<br />
⎩ v =−1<br />
5410a<br />
⎧2x−<br />
y = 2<br />
⎨<br />
⎩3x−<br />
2y = 1<br />
⎧−<br />
y = 2−2x ⎨<br />
⎩3x−2y−<br />
1= 0<br />
(1) ⎧y<br />
=− 2 + 2x<br />
⎨<br />
(2) ⎩3x−2y−<br />
1= 0<br />
( div − 1)<br />
() 1 insättes i ( 2)<br />
3x−2( − 2+ 2 x)<br />
− 1= 0<br />
( lös själv)<br />
x = 3<br />
x = 3 insättes i 1<br />
y =− 2+ 2⋅ 3= 4<br />
⎧x<br />
= 3<br />
⎨<br />
⎩ y = 4<br />
(3, 4)<br />
()<br />
5408b<br />
⎧x+<br />
2y− 9= 0<br />
⎨<br />
⎩4x−<br />
y+<br />
3= 0<br />
(1) ⎧x=−<br />
2 y+<br />
9<br />
⎨<br />
(2) ⎩4x−<br />
y+<br />
3 = 0<br />
() 1 insättes i ( 2)<br />
108<br />
4( − 2y+ 9) − y+<br />
3 = 0<br />
13<br />
y = = 4,33<br />
3<br />
13<br />
y = insättes i () 1<br />
3<br />
13 1<br />
x =−2⋅ + 9=<br />
=<br />
3 3<br />
0,33<br />
⎧ 1<br />
x = = 0,33<br />
⎪ 3<br />
⎨<br />
⎪ 13 1<br />
y = = 4 = 4,33<br />
⎪⎩ 3 3<br />
5410b<br />
⎧x+<br />
3y+ 3= 0<br />
⎨<br />
⎩x−<br />
3y+ 2= 0<br />
(1) ⎧x=−3y−3<br />
⎨<br />
(2) ⎩x−<br />
3y+ 2 = 0<br />
() 1 insättes i ( 2)<br />
( y ) y<br />
−3 −3 − 3 + 2= 0<br />
( lös själv)<br />
1<br />
y =−<br />
6<br />
1<br />
y =− insättes i () 1<br />
6<br />
⎛ 1⎞ 5<br />
x =−3⋅⎜−⎟− 3=−<br />
⎝ 6⎠ 2<br />
⎧x<br />
=−5/2<br />
⎨<br />
⎩y<br />
=−1/6<br />
⎛ 5 1⎞<br />
⎜− , − ⎟<br />
⎝ 2 6⎠