Slope-Intercept Form Word Problems

A man is climbing down from 100 feet high descending 30 feet per minute. Write an equation to model the situation. Let y = the height of the man and x = the number of minutes.

Mathematical Equivalence

ON

Sandra has a twenty-dollar iTunes gift card and spends three dollars each month.  Which equation can be used to find how much money Sandra has on her gift card after x months?

• y = 3x + 20

• y = 3 + 20x

• y = -3x + 20

• y = -20x + 3

Tim buys a new computer for his office for $1200. For tax purposes, he declares a linear depreciation (loss of value) of $200 per year. Let y be the declared value of the computer after x years. Write a linear equation in slope-intercept form to model the value of the computer over time.

Mathematical Equivalence

ON

A family buys a case of water with 48 bottles and drinks 5 bottles per day. Which equation shows the number of bottles left after x days?

• y = 48x + 5

• y = -5 + 48x

• y = -5x - 48

• y = 48 - 5x

Basmala is saving money to buy new iphone. She has saved $50 so far and plans to $20 each week for the next few months. Write an equation that represents how much money she will have after x weeks.

• y = 50x + 20

• y = -50x + 20

• y = 20x + 50

• y = -20x + 50

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