Karen makes $5 per hour baby-sitting and $12 per hour giving music lessons. one weekend, she worked a total of 18 hours and made $139. how many hours did she spend baby-sitting?

Let the number of hours she spent in baby- sitting is x

and the number of hours she spent in music lessons is y.

Now, we have been given that she worked a total of 18 hours. Hence, we have

And she made $139. Thus, we have

Substituting the value of y from equation 1 in 2, we get

Therefore, she spent 11 hours in baby-sitting.

step-by-step explanation:

r and t.

both are 64 degrees.