Evaluating and solving linear eqns Part 1

9a - ab + 5b    
if a = 2 and b = 7

• 37

• 67

• 39

• 32

Answer explanation

Substituting a = 2 and b = 7 into the expression 9a - ab + 5b gives 9(2) - (2)(7) + 5(7) = 18 - 14 + 35 = 39. Thus, the correct answer is 39.

Evaluate y + 17 if y = 11

• 11

• 17

• 27

• 28

Answer explanation

To evaluate y + 17 when y = 11, substitute 11 for y: 11 + 17 = 28. Therefore, the correct answer is 28.

Evaluate 3d if d = 5

• 3

• 5

• 12

• 15

Answer explanation

To evaluate 3d when d = 5, substitute 5 for d: 3 * 5 = 15. Therefore, the correct answer is 15.

Evaluate 4y  if       y = 3

• 7

• 12

Answer explanation

To evaluate 4y when y = 3, substitute 3 for y:

4 * 3 = 12. Therefore, the correct answer is 12.

If p = -6, what does p + 4 equal?

• 10

• -2

• -24

• -3

Answer explanation

To find p + 4, substitute p with -6

-6 + 4 = -2. Therefore, the correct answer is -2.

Identify the variables in the expression
3x +  9

• x

• y

• 9

• 3x

Answer explanation

In the expression 3x + 9, the variable is 'x'. It represents an unknown value, while '3' and '9' are constants. Therefore, the correct choice is 'x'.

How many terms are in the expression
3a + 2b + c + 100

• 3

• 4

• 5

• 6

Answer explanation

The expression 3a + 2b + c + 100 has four distinct terms: 3a, 2b, c, and 100. Therefore, the correct answer is 4.

Identify the constant in the expression
4y + 2 + x

• x

• y

• 4y

• 2

Answer explanation

In the expression 4y + 2 + x, the constant is the term that does not contain a variable. Here, '2' is the only term without a variable, making it the constant. Therefore, the correct answer is 2.

Evaluate 5x + 4y if x=3 and y=2

• 54

• 22

• 95

• 23

Answer explanation

To evaluate 5x + 4y, substitute x=3 and y=2: 5(3) + 4(2) = 15 + 8 = 23. Thus, the correct answer is 23.

Identify the coefficient of y in the expression
5x + 3y - 7

• 5

• 3

• 7

• -7

Answer explanation

In the expression 5x + 3y - 7, the coefficient of y is the number that multiplies y. Here, 3 is the coefficient of y, making the correct answer 3.