Question

1)daca ab+ac=180 si b+c= 18 afla nr. a
2)daca 15a-10b=75 afla 3a-2b

urgent!

Answer 1

1) a(b+c)=180
a*18=180
a=180:18
a=10
b) 5(3a-2b)=75
3a-2b=75:5
3a-2b=15.

Answer 2

1. a = 10 
2. 15a-10b=75 | :5
     3a-2b= 15