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 Interactive Checkpoint
Solution:  A number (or ordered pair of numbers, or set of numbers) that produces a true statement when substituted for the variable(s) in an equation or inequality.

Sally earns \$6 per hour for babysitting and receives a \$4 tip at the end of the night. Her earnings can be represented by the function

d = 6h + 4

where d dollars are earned for h hours of babysitting. Enter the missing values in the table below that relate to hours worked or dollars earned. Press TAB after each entry to check your responses.

 h hours worked d dollars earned Graded Response 1 10 2 5 52

Leon earns \$5 per hour for babysitting and receives a \$7 tip at the end of the night. His earnings can be represented by the function

d = 5h + 7

where d dollars are earned for h hours of babysitting.
 If Sally and Leon earn the same amount after one evening, then: Press TAB after each entry to check Graded Response a) How many hours did they each work? b) How much money did they each earn? \$