For each expression in Column I, use an identity to choose an expression from Column II with the same value. Choices may be used once, more than once, or not at all. cos 35 II A. sin1-352 B. cos 55 C. B 1 + cos 150 2 D. 2 sin 150 cos 150 E. cot1-352 F. cos2 150 - sin2 150 G. cos1-352 H. cot 125 I. cos 150 cos 60 - sin 150 sin 60 J. sin 15 cos 60 + cos 15 sin 60

MAT 211 Lecture 2 Section 15.1 (Continued) reviewed the table in the previous lecture’s class Linear Function General Formula with 2 Variables: z= f(x,y)= ax+by+c Ex.: z= 1.1x+0.5y+xy NOT linear! because of the xy Ex.: z= 1.1x+0.5y+10 NOT linear! because of the x and y (should be in first power) Ex.: z= x+5y+pi Linear! pi works! Ex.: Each $1 million increase in sales of x causes a $2.7 million decline in sales of brand z. a= 2.7 Each $1 million increase in sales brand y results in an increase of $0.7 million in sales of brand z. b= 0.7 All are selling $6 million per pea.=6, y=6, & z=6 6= 2.7(6)+ 0.7(6)+c Find c! z= 2.7x+ 0.7 y+c