Posted by norman on .
can anyone help with this?
suppose you bought some 32 cents stamps and some 20 cents stamps. you spent $3.92 for 16 stamps. how many of each stamp did you buy?
i got the equation.32x + .20y = $3.92 but don't know how to solve for x and y
Step 1: Solve for y in equation (1).
.20y = 3.92  .32x
Step 2: Substitute this value for y in equation (2). This will change equation (2) to an equation with just one variable, x.
.32x + .20(3.92  .32x)= 3.92
multiply it out
.32x + (.20 x 3.92)  (.20 x .32x) = 3.92
solve for x, then go back and plug x into the equation and solve for y
yes now i understand the process. i just couldn't get past seeing x and y. thanks
i get
.32x + .784 .064x = 3.92
.256x + .784 = 3.92
.256x = 3.136
x=12.25?????
Hello Norman, in case u have not solved this yet, try this:
x+y = 16
32x + 20y = 392
You will get whole number answers for x and y.

math 
Anna,
If you do try hack revise your answer works if you do .32x6 is 1.92 and add .20x10 is 200 and add 1.92 and 2.00 you get 3.92