Rozwiąż układy równań A) a=b 2a+b=9 B) u=4v 5u-v=10 C) 3r=s 3r+s=24

A) a=b 2a+b=9 a=b 2a+a=9 a=b 3a=9 |:3 a=b a=3 3=b a=3 B) u=4v 5u-v=10 u=4v 5(4v)-v=10 u=4v 20v-v=10 u=4v 19v=10 |:19 u=4v v=10/19 u=40/19 v=10/19 C) 3r=s 3r+s=24 3r=s s+s=24 3r=s 2s=24 |:2 3r=s s=12 r= 12:3 s=12 r=4 s=12

a) a = b 2a + b = 9 a = b 2a + a = 9 a = b 3a = 9 a = b a = 3 b = 3 b) u = 4v 5u - v = 10 u = 4v 5 * (4v) - v = 10 u = 4v 20v - v = 10 u = 4v 19v = 10 u = 4v v = 10/19 u = 4* (10/19) v = 10/19 u = 40/19 v = 10/19 c) 3r = s 3r + s = 24 3r = s s + s = 24 3r = s 2s = 24 3r = s s = 12 r = 12:3 s = 12 r = 4 s = 12

A) {a=b /-b {2a+b=9 {a-b=0 +{2a+b=9 -------------- 3a=9 /:3 {a=3 {a=b {a=3 {b=3 B) {u=4v /*(-5) {5u-v=10 {-5u=-20v +{5u-v=10 --------------- -v=10-20v /+20v 19v=10 /:19 {v=10/19 {u=4*10/19 {v=10/19 {u=40/19 C) {3r=s /*(-1) {3r+s=24 {-3r=-s +{3r+s=24 ------------------ s=24-s /+s 2s=24 /:2 {s=12 {3r=12 /:3 {s=12 {r=4