Can’t purchases a $20 item at a store she uses a coupon to receive a 15% discount and she pays a 6% sale taxes on the item
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B = hours babysitting
m = hours giving music lessons
so... whatever "b" and "m" are, their sum for that week was 18
thus
b + m = 18
now, money wise, she makes $5 for "b" and that is, she made 5*b or 5b that week
for "m", she makes $12, so for that week she made 12*m or 12m
whatever "b" and "m" are
thus
5b + 12m = 139
now
solve for "b", to see how many hours she spent babysitting
m = hours giving music lessons
so... whatever "b" and "m" are, their sum for that week was 18
thus
b + m = 18
now, money wise, she makes $5 for "b" and that is, she made 5*b or 5b that week
for "m", she makes $12, so for that week she made 12*m or 12m
whatever "b" and "m" are
thus
5b + 12m = 139
now
solve for "b", to see how many hours she spent babysitting