Answer:
Karen has 6 quarters and 2 dimes
Step-by-step explanation:
Let
x ----> the number of quarter coins Karen has
y ----> the number of dimes coins Karen has
Remember that

we know that
<em>Equation that represent the amount of coins Karen has</em>

isolate the variable y
----> equation A
<em>Equation that represent the value of coins Karen has</em>
----> equation B
Solve the system of equations by substitution
substitute equation A in equation B

solve for x




<em>Find the value of y</em>
----> 
therefore
Karen has 6 quarters and 2 dimes