1) 2x−3y=24
x+2y=−2
2x−3y=24,x+2y=−2
2x−3y=24
2x=3y+24
х=1/2 (3y+24)
х= 3/2у+12
3/2у+12+2у= -2
7/2у+12=−2
7/2у= -14
y=−4
х=3/2 (−4)+12
x=−6+12
x=6
x=6, y=−4
2) 15x−5y+6=3(x+y)
15x−5y+6=3x+3y
15x−5y+6−3x=3y
12x−5y+6=3y
12x−5y+6−3y=0
12x−8y+6=0
12x−8y=−6
4.2+8x−12y=2(x−2y)
4.2+8x−12y=2x−4y
4.2+8x−12y−2x=−4y
4.2+6x−12y=−4y
4.2+6x−12y+4y=0
4.2+6x−8y=0
6x−8y=−4.2
12x−8y=−6,6x−8y=−4.2
12x=8y−6
х=1/12 (8у-6)
х=2/3у-1/2
6 (2/3у-1/2)−8y=−4.2
4y−3−8y=−4.2
−4y−3=−4.2
−4y=−1.2
y=0.3
х=2/3×0.3−1/2
х=1/5-1/2
х= -3/10
х= -3/10, у= 0,3
Рада была
1) 2x−3y=24
x+2y=−2
2x−3y=24,x+2y=−2
2x−3y=24
2x=3y+24
х=1/2 (3y+24)
х= 3/2у+12
3/2у+12+2у= -2
7/2у+12=−2
7/2у= -14
y=−4
х=3/2 (−4)+12
x=−6+12
x=6
x=6, y=−4
2) 15x−5y+6=3(x+y)
15x−5y+6=3x+3y
15x−5y+6−3x=3y
12x−5y+6=3y
12x−5y+6−3y=0
12x−8y+6=0
12x−8y=−6
4.2+8x−12y=2(x−2y)
4.2+8x−12y=2x−4y
4.2+8x−12y−2x=−4y
4.2+6x−12y=−4y
4.2+6x−12y+4y=0
4.2+6x−8y=0
6x−8y=−4.2
12x−8y=−6,6x−8y=−4.2
12x−8y=−6
12x=8y−6
х=1/12 (8у-6)
х=2/3у-1/2
6 (2/3у-1/2)−8y=−4.2
4y−3−8y=−4.2
−4y−3=−4.2
−4y=−1.2
y=0.3
х=2/3×0.3−1/2
х=1/5-1/2
х= -3/10
х= -3/10, у= 0,3