Express the gross salary of a person who earns $21 per hour as a function of the number x of hours worked What is the gross salary G of a person who earns $21 per hour expressed as a function of the number x of hours ?

(The answer should have an an expression using x as the variable.)

let soccer = x and golf = y

part a

1st equation: x + y = 125

2nd equation: x = y +45

part b

replace x in the 1st equation with the 2nd one:

y + 45 + y = 125

simplify:

2y + 45 = 125

subtract 45 from each side:

2y = 80

divide both sides by 2:

y = 80/2

y = 40

she plays golf for 40 minutes.

part c

no because she plays soccer for 45 minutes longer than golf 40 +45 =   85 minutes, not 80 minutes.

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