Evaluating Expressions by Substituting

What is the value of '2x - 3'?

• 21

• 15

• 12

• 10

What is the value of 'x'?

• -5/7

• 1

• 12/7

• 3

What is the value of 'w'?

• w=9/20

• w=4/5

• w=5/4

• w=20/9

The 1st step to solving this equations is to substitute (replace) the '1' for 'x' then isolate (solve for) 'a'.

• True

• False

What is the value of 'a' if x=1?

• a= 2

• a= 1/2

• a= -2

• a= -1/2

What is the value of 't'?

• t=4/15

• t=15/4

• t=7.5

• t=3/2

Start by substituting 3 for 'x'.

• True, cause x = 3

• False, substitute the 'k' since k = 3

What is the over all process to find the value of 'y' when 'x=5'?

• Plug in (Substitute) the 24 for 'y' and 6 for 'x', then isolate (solve for) the 'k'. When you find the value of 'k', multiply it by 5 (since x=5) and you will have our answer.

• Plug in (Substitute) the 24 for 'y' and 6 for 'x', then isolate (solve for) the 'k'. That is your answer.

What do you substitute 1st to solve this situation?

• x

• y

Once you have isolated the 'b' then you are done with the problem...

• True

• False- next you need to isolate (solve for) 'a', then your done

• False- next you need to isolate (solve for) 'a', then substitute the values of each variable in to 'a + b' to find your answer