Răspuns:
Explicație pas cu pas:
a)
8x - 17 = 23
8x = 23 + 17 = 40
x = 40 : 8 = 5
proba 8*5 - 17 = 40 - 17 = 23
b)
35 + 4y = 43
4y = 43 - 35 = 8
y = 8 : 4 = 2
proba 35 + 4*2 = 35 + 8 = 43
c)
12x + 16 = -68
12x = -68 - 16 = -84
x = -84 : 12 = -7
proba 12*(-7) + 16 = -84 + 16 = -68
d)
9y - 44 = 55
9y = 55 + 44 = 99
y = 99 : 9 = 11
proba 9*11 - 44 = 99 - 44 = 55
e)
3y + 13 = 1
3y = 1 - 13 = -12
y = -12 : 3 = -4
proba 3*(-4) + 13 = -12 + 13 = 1
f)
3y - 28 = 14
3y = 14 + 28 = 42
y = 42 : 3 = 14
proba 3*14 - 28 = 42 - 28 = 14
g)
14 - 2x = 6
2x = 14 - 6 = 8
x = 8 : 2 = 4
proba 14 - 2*4 = 14 - 8 = 6
h)
25 - 6y = -5
6y = 25 + 5 = 30
y = 30 : 6 = 5
proba 25 - 6*5 = 25 - 30 = -5