
ա) Այո
բ) Այո
գ) Ոչ
դ) Ոչ
ե) Ոչ
զ) Այո
է) Ոչ
ը) Ոչ
թ) Ոչ
ժ) Այո

ա) 7 x 10 — 5 x 11
70 — 55 = 15
Այո:
բ) 7 x 5 — 5 x (-4)
35 + 20 = 55
Ոչ:
գ) 7 x 0 — 5 x (-3)
0 + 15 = 15
Այո:
դ) 7 x (-5) — 5 x 10
-35 — 50= -85
Ոչ:
ե) 7 x (-1) — 5 x 4.2
— 7 — 21 = -28
Ոչ:

ա) 3 + 2 x 7 = 17
Ոչ:
բ) 2 x 3 + 7 = 13
Այո:
գ) 5 x 3 — 3 x 7 = -6
Այո:
դ) 23 x 3 — 11 x 7 = -8
Այո:
ե) 17 x 3 + 26 x 7 = 233
Ոչ:
զ) -1.5 x 3 — 0.4 x 7 = -7.3
Այո:

ա) (2 x 6) — 2 = 10
(6, 2)
բ) 9 + (5 x 3) = 24
(9, 3)
գ) (2 x 15) — (6 x 2) = 18
(15, 2)
դ) (11 x 3) — (5 x 5) = 8
(3, 5)
ե) (7 x 3) + (2 x 1) = 23
(3, 1)
զ) (0.5 x 10) — (0.4 x (-5) = 3
(10, -5)
է) (1/3 x 3) — (2/15 x 30) = -3
(3, 30)

2x + 3y = 120
ա) (2 x 10) + (3 x 50) = 170
Ոչ:
բ) (2 x 15) + (3 x 30) = 120
Այո:
գ) (2 x 60) + (3 x 0) = 120
Այո:
դ) (2 x 0) + (3 x 60) = 180
Ոչ:
ե) (2 x 27) + (3 x 22) = 120
Այո:
զ) (2 x 3) + (3 x 38) = 120
Այո:

ա) x — y = 2
x = 2 + y
y = x — 2
բ) x + y — 3 = 0
x = 3 — y
y = 3 — x
գ) x — 3y = 7
x = 7 + 3y
3y = x — 7
y = (x — 7)/3
դ) x — 38y + 156 = 0
x = 38y — 156
38y = x + 156
y = (x + 156)/38
ե) 4x — 12y + 8 = 0
4x = 12y — 8
x = (12y — 8)/4
12y = 4x + 8
y = (4x + 8)/12
զ) 3x + 5y = 7
3x = 7 — 5y
x = (7 — 5y)/3
5y = 7 — 3x
y = (7 — 3x)/5
է) 2x — 7y + 56 = 0
2x = 7y — 56
x = (7y — 56)/2
7y = 2x + 56
y = (2x + 56)/7
ը) 0.5x + 2y = 4
0.5x = 4 — 2y
x = (4 — 2y)/0.5
2y = 4 — 0.5x
y = (4 — 0.5x)/2

թ) 6x — 3y + 27 = 0
6x = 3y — 27
x = (3y — 27)/6
3y = 6x + 27
y = (6x + 27)/3
ժ) 3x — 8y = 0
3x = 8y
x = 8y/3
8y = 3x
y = 3x/8