Question

expressions-polynomials-linear exp
(1 point)
evaluate each of the following expressions if x = 9, y = 5, z = -4.
x + 12 =

x + 3y + z =

(x - 12) + 3(y + z) =

100x + yz =

Explanation:

For \( x + 12 \):

Step1: Substitute \( x = 9 \)

\( 9 + 12 \)

Step2: Calculate the sum

\( 9 + 12 = 21 \)

Step1: Substitute \( x = 9 \), \( y = 5 \), \( z = - 4 \)

\( 9+3\times5+(-4) \)

Step2: Calculate multiplication first

\( 9 + 15-4 \)

Step3: Calculate the result

\( 9 + 15-4=20 \)

Step1: Substitute \( x = 9 \), \( y = 5 \), \( z = - 4 \)

\( (9 - 12)+3\times(5+(-4)) \)

Step2: Calculate inside the parentheses

\( - 3+3\times1 \)

Step3: Calculate multiplication

\( - 3 + 3 \)

Step4: Calculate the result

\( - 3+3 = 0 \)

Answer:

21

For \( x + 3y + z \):