Graphing Equations With Two Variables

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Presentation transcript:

Graphing Equations With Two Variables COURSE 3 LESSON 3-2 Determine whether each ordered pair is a solution of y = 2x + 8. a. (4, 8) y = 2x + 8 8 2(4) + 8 Substitute 8 for y. Substitute 4 for x. 8 8 + 8 8 16 = / (4,8) is not a solution. 3-2

Graphing Equations With Two Variables COURSE 3 LESSON 3-2 (continued) b. (–2, 4) y = 2x + 8 4 2(–2) + 8 Substitute 4 for y. Substitute –2 for x. 4 –4 + 8 4 = 4 (–2, 4) is a solution. 3-2

Graphing Equations With Two Variables COURSE 3 LESSON 3-2 The equation y = 12x + 5 describes the cost y in dollars to order x CDs from a catalog. Complete the solution (5, ? ). How much will it cost to buy 5 CDs? Complete the solution (5, ? ) to find out how much 5 CDs will cost. y = 12x + 5 = 12(5) + 5 Substitute 5 for x. = 60 + 5 Multiply. = 65 Add. A solution is (5, 65). It will cost $65 to buy 5 CDs. Check for Reasonableness If it costs $65 to buy 5 CDs, the cost for one CD is about or $13. $13 is a reasonable cost for a CD. $65 5 3-2