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# January 21, 2014

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### January 21, 2014

1. 1. HELP!!....with the Final Exam S = 2(a + b)h + 2ab Find a , in terms of S , h , and b . S = 2ah + 2bh + 2ab S – 2bh = a(2h + 2b) S – 2bh = a 2h + 2b Yu drove 3,300 miles from New York to London. Gas was \$4.00/gallon, and the car averaged 25 MPG. How much did Yu spend on gas? 132 gal. x \$4.00/gal. = \$528 Mi had \$40 and spent \$30. What percent did Mi spend? 6 – 3s = 5(4 - 2s) 6 – 3s = 20 - 10s -14 = - 7s; s = 2
2. 2. Review: 1 Question Write the equation of a line that is: a) parallel and b) perpendicular, to the line y = 2x - 1
3. 3. Applying Linear Functions (0,120) Y = 15x + 120 1. Determine the independent & dependent variables. 2. Determine the constant & the variable(s). 3. Determine the intercept & write the equation. What is the y-intercept? \$120. Really it should be \$135 4. Determine the slope 15 5. Plot points & draw the line. 6. Answer the question \$120 + (15x7) = \$225
4. 4. cost # of photos Y = 3.99x + 1.49 1. Determine the independent & dependent variables. 2. Determine the constant & the variable(s). 3. Determine the intercept & write the equation. What is the y-intercept? 0 3.99 4. Determine the slope 1 5. Plot points & draw the line. 6. What is the domain of the function? 7. Answer the original question
5. 5. Last Problem (very different) What points can we plot first? Find the intercepts first. What is the equation of this line? 1.2V(x) + 2.5P(y) = \$300 2. Make a table between zero and the intercepts, plug in values, plot the points.
6. 6. Plot the intercepts Make a Table Both plants must be whole numbers and total \$300. You cannot have 40 Vinca plants. Why not?? P (0,120) (100,72) 1.2V + 2.5P = \$300 P (250,0) 100 72 150 (150,48) V V 48 1.20v x 100 + 2.5p x 72 1.20v x 150 + 2.5p x 48 Why is the slope negative?
7. 7. Class Work: See Handout