Algebra 1
posted by connie on .
REINY, Thank you for your answer and the answer is obviously correct when you go back and do the multiplying ......however , I do not just want the answer, I desperately wish to understand from start to finish how you got the answer. I am sorry if I seem stupid, really , but how did you get 2x = 18 , x=9 where did the 18 come from? I am so confused. Thanks for your help!!!! connie Original Question
solve if x=student price and y =adult price and 2y + 5x=77 and 2y + 7x=95 what are the price for admission for both adult and child. Your Answer:subtract them:
2x = 18
x=9
sub into the first:
2y + 45 = 77
2y = 32
y = 16

You didn't read his response carefully. The first instruction was "subtract them".
Assuming you understand the context of the problem, he meant to subtract one equation from the other:
2y+7x=95
2y+5x=77
 subtract and the 2y2y goes away!
2x = 18
so, x=9
smooth sailing from there on.