rozwiaż podane równania metodą podstawiania:
a) 2x-2y=7
4x+3y=21
b)3m+n=9
2m-5n= -11
c) 4a-2=b
3a+7b=1,5
a) 2x-2y=7 /2
x-y=7/2
x=7/2+y
4x+3y=21 -----> 4*(7/2+y)+3y=21
14+4y+3y=21
14+7y=21
7y=21-14
7y=7
y=1
2x-2*1=7
2x-2=7
2x=7+2
2x=9/2
x=4,5
n=9-3m
2m-5*(9-3m)=-11
2m-45+15m=-11
17m=34/17
m=2
n=9-3*2
n=3
3a+7*(4a-2)=1,5
3a+28a-14=1,5
31a=15,5/31
a=0,5
b=4*0,5-2
b=0
Pozdrawiam :)
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a) 2x-2y=7 /2
4x+3y=21
x-y=7/2
x=7/2+y
4x+3y=21 -----> 4*(7/2+y)+3y=21
14+4y+3y=21
14+7y=21
7y=21-14
7y=7
y=1
2x-2*1=7
2x-2=7
2x=7+2
2x=9/2
x=4,5
b)3m+n=9
2m-5n= -11
n=9-3m
2m-5*(9-3m)=-11
2m-45+15m=-11
17m=34/17
m=2
n=9-3*2
n=3
c) 4a-2=b
3a+7b=1,5
3a+7*(4a-2)=1,5
3a+28a-14=1,5
31a=15,5/31
a=0,5
b=4*0,5-2
b=0
Pozdrawiam :)