Evaluating algebraic expressions by substitution practice exercise 1

Course: Grade 8 mathematics - Algebra - Algebraic expressions

Quiz Description

Quiz Questions (46 questions)

Question 1
A boda boda covers a distance given by 3x + 2y metres, where x = 150 and y = 100. Find the total distance.
Question 2
A boda boda covers a distance given by 3x + 2y metres, where x = 150 and y = 100. Find the total distance.  (1mark)
Question 3
A boda boda covers a distance given by 3x + 2y metres, where x = 150 and y = 100. Find the total distance.  (1mark)
Question 4
A boda boda covers a distance given by 3x + 2y metres, where x = 150 and y = 100. Find the total distance.  (1 mark)
Question 5
If m = 10 and n = 6, evaluate: (m² − n²) / (m − n)
Question 6
If m = 10 and n = 6, evaluate: \( \frac{m² - n²}{m - n} \).  (1mark)
Question 7
If m = 10 and n = 6, evaluate: \( \frac{m² - n²}{m - n} \).  (1mark)
Question 8
If m = 10 and n = 6, evaluate: \( \frac{m² − n²}{m - n} \).  (1mark)
Question 9
If m = 10 and n = 6, evaluate: \( \frac{m² − n²}{m - n} \).  (1mark)
Question 10
If m = 10 and n = 6, evaluate: \( \frac{m^2 − n^2}{m - n} \).  (1mark)
Question 11
If m = 10 and n = 6, evaluate: \( \frac{m^2 − n^2}{m - n} \).  (1mark)
Question 12
If m = 10 and n = 6, evaluate: \( \frac{m^2 − n^2}{m - n} \).  (1 mark)
Question 13
A painter uses 2 litres of red paint costing KES x per litre and 3 litres of blue paint costing KES y per litre. If x = 150 and y = 120, find the total cost using: 2x + 3y
Question 14
A painter uses 2 litres of red paint costing KES x per litre and 3 litres of blue paint costing KES y per litre. If x = 150 and y = 120, find the total cost using: 2x + 3y.  (1mark)
Question 15
A painter uses 2 litres of red paint costing KES x per litre and 3 litres of blue paint costing KES y per litre. If x = 150 and y = 120, find the total cost using: 2x + 3y.  (1mark)
Question 16
A painter uses 2 litres of red paint costing KES x per litre and 3 litres of blue paint costing KES y per litre. If x = 150 and y = 120, find the total cost using: 2x + 3y.  (1 mark)
Question 17
Evaluate \(5x - 2y\) given \(x = 8\), \(y = 6\).
Question 18
Evaluate \(5x - 2y\) given \(x = 8\), \(y = 6\). (1 mark)
Question 19
Evaluate \(5x - 2y\) given \(x = 8\), \(y = 6\). (1 mark)
Question 20
Evaluate \(\frac{xy + 2z}{x}\) given \(x = 5\), \(y = 8\), \(z = 10\).
Question 21
Evaluate \(\frac{xy + 2z}{x}\) given \(x = 5\), \(y = 8\), \(z = 10\). (1 mark)
Question 22
Evaluate \(\frac{xy + 2z}{x}\) given \(x = 5\), \(y = 8\), \(z = 10\). (1 mark)
Question 23
Evaluate: 4x − y when x = 5 and y = 7.
Question 24
Evaluate: 4x − y when x = 5 and y = 7.  (1mark)
Question 25
Evaluate: 4x − y when x = 5 and y = 7.  (1mark)
Question 26
Evaluate: 4x − y when x = 5 and y = 7.  (1 mark)
Question 27
A tailor is cutting fabric for three uniform pieces. Their lengths in metres are: 4x − 3 2x + 1 x + 2 If x = 3, what is the total length of fabric used?
Question 28
A tailor is cutting fabric for three uniform pieces. Their lengths in metres are: 4x − 3, 2x + 1, x + 2. If x = 3, what is the total length of fabric used?  (1mark)
Question 29
A tailor is cutting fabric for three uniform pieces. Their lengths in metres are: 4x − 3, 2x + 1, x + 2. If x = 3, what is the total length of fabric used?  (1mark)
Question 30
A tailor is cutting fabric for three uniform pieces. Their lengths in metres are: 4x − 3, 2x + 1, x + 2. If x = 3, what is the total length of fabric used?  (1mark)
Question 31
A tailor is cutting fabric for three uniform pieces. Their lengths in metres are: 4x − 3, 2x + 1, x + 2. If x = 3, what is the total length of fabric used?  (1mark)
Question 32
A tailor is cutting fabric for three uniform pieces. Their lengths in metres are: 4x − 3, 2x + 1, x + 2. If x = 3, what is the total length of fabric used?  (1 mark)
Question 33
A hardware store in Embu sells materials whose prices (in KES) are represented by: 5x − 4 2x + 10 x + 6 If x = 2, what is the total cost?
Question 34
A hardware store in Embu sells materials whose prices (in KES) are represented by: 5x − 4, 2x + 10, x + 6. If x = 2, what is the total cost?  (1mark)
Question 35
A hardware store in Embu sells materials whose prices (in KES) are represented by: 5x − 4, 2x + 10, x + 6. If x = 2, what is the total cost?  (1mark)
Question 36
A hardware store in Embu sells materials whose prices (in KES) are represented by: 5x − 4, 2x + 10, x + 6. If x = 2, what is the total cost?  (1mark)
Question 37
A hardware store in Embu sells materials whose prices (in KES) are represented by: 5x − 4, 2x + 10, x + 6. If x = 2, what is the total cost?  (1 mark)
Question 38
Evaluate: 2x² + y when x = 3 and y = 5.
Question 39
Evaluate: 2x² + y when x = 3 and y = 5.  (1mark)
Question 40
Evaluate: 2x² + y when x = 3 and y = 5.  (1mark)
Question 41
Evaluate: 2x² + y when x = 3 and y = 5.  (1 mark)
Question 42
If a = 6, b = 2, and c = 4, evaluate: (a² − b² + c) / (a − b)
Question 43
If a = 6, b = 2, and c = 4, evaluate:\( \frac{a² - b² + c}{a - b} \). (1mark)
Question 44
If a = 6, b = 2, and c = 4, evaluate:\( \frac{a^2 - b^2 + c}{a - b} \). (1mark)
Question 45
If a = 6, b = 2, and c = 4, evaluate:\( \frac{a^2 - b^2 + c}{a - b} \). (1mark)
Question 46
If a = 6, b = 2, and c = 4, evaluate:\( \frac{a^2 - b^2 + c}{a - b} \). (1 mark)

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