Question 137178This question is from textbook
: Could you please solve this problem by addition method?
x+y=13
22x+36y=356
Thank you.
This question is from textbook
Answer by checkley77(12844)   (Show Source):
You can put this solution on YOUR website! JUST A COMMENT ON NOT KNOWING IF YOU HAVE THE CORRECT ANSWER.
ASSUMING (?) YOU HAVE THE CORRECT FORMULA, WHICH IS THE DIFFICULT PART WHEN SOLVING WORK PROBLEMS, THEN DOING THE PROOF BY REPLACING THE UNKNOWN(S) WITH THE ANSWER WILL HELP A LOT.
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x+y=13 multiply this equation by -22 & add.
22x+36y=356
-22x-22y=-286
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0+14y=70
y=70/14
y=5 answer.
x+5=13
x=13-5
x=8 answer.
proof:
22*8+36*5=356
176+180=356
356=356
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