Question 628130
John works two part-time jobs for a total of 25 hours per week.
 Job A pays $7.50 per hour and Job B pays $8.40 per hour.
 How many hours did he work at each job if he made $200.10 this week? 
:
Let a = no. of hrs worked at job A
Let b = no. of hrs worked at job B
:
Write an equation for each statement;
:
"John works two part-time jobs for a total of 25 hours per week."
a + b = 25
a = (25-b); we can use this form for substitution
;
"Job A pays $7.50 per hour and Job B pays $8.40 per hour.he made $200.10"
7.50a + 8.40b = 200.10 
replace a with (25-b)
7.50(25-b) + 8.40b = 200.10
187.50 - 7.50b + 8.40b = 200.10
-7.50b + 8.40b = 200.10 - 187.50
.90b = 12.60
b = 12.60/.9
b = 14 hrs on job B
:
I'll let you find job A, ensure the $ add up 200.10