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2x+4y=24 podstawiamy x => 2(3y+7)+4y=24
6y+14+4y=24
10y=10
y=1 podstawiamy y x=3*1+7=10
b) -3x+y=-20 => y=3x-20
4x-y=26 podstawiamy y => 4x-(3x-20)=26
4x-3x+20=26
x=6 podstawimy y=3*6-20=-2
c) 5-3x+2y=22
x-2y+15=0 => x=2y-15
5-3x+2y=22 podstawiamy x => 5-3(2y-15)+2y=22
5-6y+45+2y=22
-4y=-28
y=7
x=2*7-15=14-15=-1
d) 4x=3y+27
6x+y-13=0 => y=-6x+13
4x=3y+27 podstawiamy y => 4x=3(-6x+13)+27
4x=-18x+39+27
22x=66
x=3
y=-6*3+13=-18+13=-5
mam nadzieję że pomogłęm :D
2x+4y=24
x = 7+3y
2(7+3y)+4y=24
14+6y +4y =24
10y = 10
y =1
x = 7+3*1
x=10
b)
-3x+y= -20
4x-y=26
y = -20+3x
4x -(-20+3x) =26
4x+ 20-3x = 26
x = 6
y = -20+ 3*6
y = -2
c)
5-3x+2y=22
x-2y+15=0
-3x+2y = 17
x = -15+2y
-3(-15+2y)+2y = 17
45-6y+2y =17
-4y = -28
y=7
x= -15+2*7
x= -1
d)
4x=3y+27
6x+y-13=0
4x-3y = 27
y = 13-6x
4x -3(13-6x) = 27
4x -39+18x = 27
22x = 66
x =3
y = 13-6*3
y = 13-18
y=-5