Algebra

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• Do we have enough money to drive this far?
• Well 2 months ago we drove 300 km and it cost us \$366, and last month we drove 1500 km and it cost us \$510.
• That means our y-intercept is 330 and that our slope is 0.12.
• That means that our equation would be c = .12d + 330. In this equation c = cost and d = distance. This is the right equation because our car costs \$330 a month and for each kilometer we drive it costs \$0.12.
• The slope is the rate of change in our equation and the y-intercept is the point at which our line passes through the y-axis when our equation is graphed.
• How far can we drive this month?
• Since we only have \$600 we can only drive 2250 km this month.
• So that means that if we drive 1000 km in a month then it will cost \$450, and if we drive 2000 km in a month it will cost \$570.
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