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 Interactive Checkpoint
 System of Equations:  Two or more equations that together define a relationship between variables usually in a problem situation. It can have no solution, one solution, or many solutions.

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.

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:

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Graded Response
a) How many hours did they each work?
a)
b) How much money did they each earn?
b) $