Guided Practice for Sect. 1.2­1.3
Ex 1: Evaluate each expression for the given values of the variables.
a) a ­ 2b + ab for a = 3 and b = ­1
b) ­x2 ­ 2(x + 1) for x = 3
Now do pg. 15 #2, 4 & 5
2) 26
4) ­16
5) ­16
Guided Practice for Sect. 1.2­1.3
Ex 2: Simplify each expression by combining like terms.
a) 2x2 + 5x ­ 4x2 + x ­ x2
b) ­2(r + s) ­ (2r + 2s)
Now do pg. 15 #28 & #33
28)
33)
xy + 3x
­3a + 15b
Guided Practice for Sect. 1.2­1.3
Ex 3: Solve each equation.
a) 13y + 48 = 8y ­ 47
b) 3x ­ 7(2x ­ 13) = 3(­2x + 9)
c) 3m + 12 ­ m = 28
Now do pg. 21 #1, 8 & 14
1) w = 23
8) y = 1.5 (or 3/2)
14) w = ­6
Guided Practice for Sect. 1.2­1.3
Ex 4: Write an equation and solve it to answer the question.
a) The formula for converting temperature from Fahrenheit to Celsius is F = 9/5C + 32. Find the temperature in degrees Fahrenheit if the temperature is 30℃. b) A dog kennel owner has 120 ft. of fencing to enclose a rectangular dog run. She wants it to be five times as long as it is wide. Find the dimensions of the dog run.
c) The sum of three consecutive integers is 90. Find the three numbers.
Now do pg. 16 #46a, pg. 22 #31 and pg. 23 #54
46a) ≈180 million
31) 7.5 cm by 4.5 cm
54) 34, 36, 38 and 40