Question

Ex 19 repede va rog
Trebuie să plec la scoala
Dau coroana

Answer 1

a) 12 + 3a + 6b = 51

3 * (a+2b) = 51-12

a+2b = 39 : 3

a +2b = 13

b) 4a + 6b - 3 = 11

2 * (2a+3b) = 11 + 3

2a + 3b  = 14 : 2

2a + 3b=7

3 * (2a + 3b) = 7

2a+3b=7 * 3 = 21

c) 7a + 9b+5= a+b+17

7a-a+9b-b= 17-5

6a+8b=12

2 * (3a+4b) = 12

3a+4b = 12 : 2 =6

5 *(3a + 4b) = 6

3a + 4b = 6* 5= 30