Question

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Answer 1

46. (3) 29

47. (1) y = -4x + 3

48. (3) 3

49. (3) -1/2

50. (4) 25x - 75

Explanation:

Question 46

• Let red marbles be 2x + 3 and black marbles be x
• 2x + 3 + x = 42
• 3x = 39
• x = 13
• No. of red = 2(13) + 3 = 29 marbles
• (3) 29

Question 47

• Parallel to a line means the slope is the same
• (1) y = -4x + 3

Question 48

• For the expression to be undefined, the denominator has to be 0
• x - 3 = 0
• x = 3
• (3) 3

Question 49

• Slope = -4 - 1 / 4 + 6
• Slope = -5/10
• Slope = -1/2
• (3) -1/2

Question 50

• Total = 25x
• Left 3 boxes at home = -3x = -3(25) = -75
• (4) 25x - 75