You have 22 quarters and dimes. They total value is $4.90. How many dimes do you have?

4 Dimes

Step-by-step explanation:

You can use the equations you have and solve using either method (graphing, substitution, elimination) substitution works fine!  Since with substitution you to isolate at least one variable, you can use the second equation to get either x or y by itself.  Once you have done that, you can substitute its "value" into the other equation and solve.

so

x(.25) + y(.10) = 4.9

x + y = 22

18(.25) + 4(.20) = 4.9

18 + 4 = 22

x= quarters

y= dimes

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.

i dont know sorry

step-by-step explanation: