Oblicz: {2A +3B=42 {A+B= 18 {4a-2=b {3a+7b= 1,5

{2A +3B=42 {A+B= 18 | - A 2A + 3B = 42 B=18-A 2A+3(18-A)=42 B=18-A 2A+54-3A=42 B=18 - A -A+54=42 | - 54 B=18-A -A=-12 | *(-1) B=18-A A=12 B=18 - 12 A=12 B=6 ____________ {4a-2=b {3a+7b= 1,5 b=4a-2 3a+7(4a-2)=1,5 b=4a-2 3a+28a-14=1,5 b=4a-2 31a-14=1,5 |+14 b=4a-2 31a=15,5 |:31 b=4a-2 a=0,5 b=4*0,5-2 a=0,5 b=0 a=0,5

Oblicz: {2A +3B=42 {A+B= 18 {A = 18-B {2A +3B=42 {A = 18-B {2*(18-B) +3B = 42 {A = 18-B {36 -2B +3B = 42 {A = 18-B { B = 42-36 = 6 {A = 18-6 = 12 {B = 6 {A = 12 {B = 6 2) {4a-2=b {3a+7b= 1,5 {b = 4a -2 {3a +7(4a-2) = 1,5 {b = 4a -2 {3a +28a -14 = 1,5 {b = 4a -2 {31a = 1,5 +14 {b = 4a -2 {a = 15,5 : 31 = 1/2 {b = 4*(1/2) -2 = 2-2 =0 {a = 1/2 {a = 1/2 {b = 0

a. {2A +3B=42 {A+B=18 {2A +3B=42 {A=18-B {2(18-B)+3B=42 {A=18-B {36-2B+3B=42 {A=18-B {B=42-36=6 {A=18-6=12 {B=6 {A=12 b. {4a-2=b {3a+7b= 1,5 {4a-2=b {3a+7(4a-2)=1,5 {4a-2=b {3a+28a-14=1,5 {4a-2=b {31a=15,5 {4a-2=b {a=15,5/31=0,5 {b=4*0,5-2=0 {a=0,5