write an equation for the problem. then use the equation to answer the question.
Trevor's weekly allowance is calculated using a point system. For each chore he does, Trevor gets a point. For each chore he misses, he loses a point. Each point is worth $2, and negative points mean that Trevor owes money to his parents.
If Trevor has a total of 8 assigned chores each week, how much can he expect to earn or owe using the point system.
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Let's denote the number of chores Trevor chooses to do each week by the variable x. Then, the number of chores he does not do, will be 8 - x, since he has a total of 8 assigned chores each week.
Since each chore is worth a point, and each point I worth $2, the amount of money he earns by doing x chores is $(2x), and the amount of money he loses by not doing (8 - x) chores is $2(8 - x).
His total "balance" for each week, denoted by B, will then be, in dollars
B = (2x) - 2(8 - x). (Money earned - money lost.)
Simplifying this expression results in
B = 2x - 16 + 2x = 4x - 16.
The amount of money Trevor can expect to earn or owe each week is described by B = 4x - 16, where x is the number of chores.
Since x is the number of chores he chooses to do each week, it is an integer between 0 and 8:
x = 0, 1, 2, ,,,8
The possible values of his balance each week are
If x = 0 (he does not do any chores) B = 4*0 - 16 = -16. He owes his parents 16 dollars.
x = 1 B = -12
x = 2 B= -8
x = 3 B = -4
x = 4 B = 0 He neither earns nor owes money.
x = 5 B = 4 He earns 4 dollars.
x = 6 B = 8
x = 7 B = 12
x = 8 B = 16 The most money he can earn, by performing all 8 chores, is 16 dollars.
The possible amounts Trevor might owe are $16, $12, $8, $4.
He might also earn and owe nothing.
He might earn $4, $8, $12, or $16.
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