Question

a+b=8 a-b=12
a)a= si b=
b)solutie ecuatiei ax+b=18 x=
c)3a-2b=

Answer 1

a) a-b=12 rezulta ca a=b+12

a+b=8

b+12+b=8

2b=8-12=-4

b=-4/2

b=-2

a=b+12

a=-2+12

a=10

b) ax+b=18

10x+(-2)=18

10x-2=18

10x=18+2=20

x=20/10

x=2

c)3a-2b=3×10-2×(-2)=30+4=34

succes!