1) a = 7 - 5b
3(7 - 5b) -2b = 4
a = 7 - 5b
-17b = -17
b = 1
a = 7 - 5 = 2
(2; 1)
2) u = 17 + 3v
17 + 3v - 2v = -13
u = 17 + 3v
v = -30
u = 17 - 90 = -73
(-73; -30)
3) p = 11 - 12q
5(11 - 12q) - 3q = 3
p = 11 - 12q
-63q = -52
q = 52/63
p = 11 - 208/21 = 23/21
(23/21; 52/63)
4) y= 4 + 2x
7x - 4 - 2x = 1
y = 4 + 2x
5x = 5
x = 1
y = 4 + 2 = 6
(1; 6)
5) n = 2m - 0,5
3m - 5(2m - 0,5) = 12
n = 2m - 0,5
-7m = 9,5
m = 19/14
n = 19/7 - 1/2 = 31/14
(19/14; 31/14)
6) x = 25 + 4y
3(25 + 4y) - 2y = 30
x = 25 + 4y
10y = -45
y = -4,5
x = 25 - 18 = 7
(7; -4,5)
46410/13/17+385
3570/17+385
210+385
595
Решение 2х номеров находится в прикрепленном изображении
9×4+3×(5-4)=39
52+4+(11+6)=73