SOLUTION: Please help and thank you, also pls show solution to the problem, 3a-3b=-15 -3a-3b=-3 a=? b=?

Question 727799: Please help and thank you, also pls show solution to the problem,
3a-3b=-15
-3a-3b=-3
a=?
b=?
Answer by hoomanc(14) (Show Source): You can put this solution on YOUR website!
ok. just a simple explanation, assume,
D= -15 & N=-3 , you agree that D+N=-15-3=-18
it's exactly like that, sum the two equation with each other:
D >>> 3a-3b=-15
N >>> -3a-3b=-3
D+N >>> (3a-3a)+(-3b-3b)=-18
D+N >>> (-6b)=-18 >>>
b=3 >>>
(D >>> 3a-3*3=-15 >>> 3a =-15+9 =-6 )
a=-2
RELATED QUESTIONS
Solve this system of equations using the elimination method: 3a-3b=-15 -3a-3b=-3... (answered by jim_thompson5910)

suppose 3 (answered by josgarithmetic,ikleyn)
3a+3b ______... (answered by Fombitz)
3a+ab+b^2+3b Thank... (answered by jim_thompson5910)
Hey can you please help me with the signs?We have to find b, (a+1)/b +3=4a/b (a+1)/b... (answered by Fombitz)
Simplify (be sure to rationalize all denominators) 10. 3b[SQRT(27a^5b)] +... (answered by Earlsdon,jim_thompson5910)
can you please help me with this problem {3a+b+c=7 (answered by venugopalramana)
please multiply and simplify this problem. (3a^2b)(2a^3b^2)(-ab^4) thank... (answered by jim_thompson5910)
Solve this system of equations using the elimination method: 3a-3b=-15 -3a-3b=-3 (answered by checkley79)