SOLUTION: Use substitution to solve NP+ND=50 NP+10ND=140

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Question 209572This question is from textbook
: Use substitution to solve
NP+ND=50
NP+10ND=140 This question is from textbook

Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
NP+ND=50 or NP=50-ND
NP+10ND=140
(50-ND)+10ND=140
9ND=140-50
9ND=90
ND=90/9
ND=10 ANS.
NP=50-10
NP=40 ANS.
PROOF:
40+10*10=140
40+100=140
140=140