She should buy 5 liters of juice.
Answer:
x = 15
Step-by-step explanation:
isolate the variable by dividing each side by the factors that don’t contain the variable
<h2>
Answer:</h2>
Like you said, we need to use <u><em>substitution</em></u> to solve for y.

Now that we've solved for y, we can plug in the number we got into one of the <u><em>original</em></u> equations. (You can choose either equation, but I will use the first one.)

Now we have the solution of this system.

It's not a rational number because it's a continuous decimal. A rational number has an end.