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: