Finding x and y, given costs of 9 pens, 13 pens

[pecan_tart]

Okay....problem

9 pens cost $11 and x cents
13 pens cost $15 and y cents

Find x and y

I tried substitution....

 

[jwpaine]

Re: Find X and Y

Okay....problem

9 pens cost $11 and x cents
13 pens cost $15 and y cents

Find x and y

I tried substitution....

Normally when I see something, even for a second, I will remember if I have seen the problem several days/weeks/months later:

http://www.freemathhelp.com/forum/viewt ... ght=#99073

.....so what is the point of asking again? You can always bump your post and ask for more guidance. Starting over when people have already provided you with hints is annoying for the tutors.

Best of luck!
John

 

[Deleted member 4993]

Okay....problem

9 pens cost $11 and x cents
13 pens cost $15 and y cents

Find x and y

I tried substitution....

Please show us how you have tried substitution - or whatever else!