Substitution

## Difficult

Q1) if a = 10 and b = 9, What is a + b ?
Q1) if a = 8 and b = 4, What is 2a + b ?
Q1) if a = 5 and b = 3, What is 3a + 4b ?
Q2) if a = 7 and b = 3, What is a + b ?
Q2) if a = 1 and b = 6, What is 2a + b ?
Q2) if a = 6 and b = 9, What is 9a + 7b ?
Q3) if a = 2 and b = 6, What is a + b ?
Q3) if a = 2 and b = 3, What is 2a + b ?
Q3) if a = 3 and b = 6, What is 9a -2b ?
Q4) if a = 9 and b = 4, What is a + b ?
Q4) if a = 4 and b = 8, What is 2a + b ?
Q4) if a = 9 and b = 2, What is 5a -7b ?
Q5) if a = 3 and b = 2, What is a + b ?
Q5) if a = 3 and b = 5, What is 2a + b ?
Q5) if a = 8 and b = 2, What is 8a + 5b ?
Q6) if a = 6 and b = 9, What is a + b ?
Q6) if a = 7 and b = 7, What is 2a + b ?
Q6) if a = 3 and b = 4, What is 2a + 8b ?
Q7) if a = 10 and b = 6, What is a + b ?
Q7) if a = 10 and b = 4, What is 2a + b ?
Q7) if a = 3 and b = 5, What is 8a + 6b ?
Q8) if a = 3 and b = 1, What is a + b ?
Q8) if a = 10 and b = 1, What is 2a + b ?
Q8) if a = 1 and b = 4, What is 3a + 8b ?
Q9) if a = 4 and b = 7, What is a + b ?
Q9) if a = 8 and b = 3, What is 2a + b ?
Q9) if a = 4 and b = 1, What is 3a -9b ?
Q10) if a = 4 and b = 2, What is a + b ?
Q10) if a = 5 and b = 5, What is 2a + b ?
Q10) if a = 5 and b = 8, What is 10a + 7b ?