3.2 Evaluating Expressions

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Mathematics

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8th Grade

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Elizabeth Nixon

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5 Slides • 5 Questions

3.2 Evaluating Algebraic Expressions

Think about our example from Monday with the cap and shirts.
When we bought 1 cap and n shirts the cost was
$(10+8n). Now what would the cost be if we bought 9 shirts?

We will replace the n with an 8: $[10 + 8(9)].
This will give us a total cost of: $[10 + 72] = $82

This process of replacing a variable with its value to find the exact value of an expression is called substitution.

Math Response

Now its your turn, Try It a from your notes:

When x = 5 and y = 2, find the value of

2x - 7y

Type answer here

Deg^°

Rad

Math Response

Now its your turn, Try It b from your notes:

When x = 5 and y = 2, find the value of

$xy^2-3xy+10$

Type answer here

Deg^°

Rad

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Multiple Choice

When $x=\frac{3}{4}$ , y = 4 and z = -1, evaluate the following:

$z\left(8x+yz\right)$

-2

-8

Multiple Choice

When $x=\frac{3}{4}$ , y = 4 and z = -1, evaluate the following:

$\frac{10xy-z+2}{xy^2-3}$

$\frac{3}{11}$

$\frac{11}{3}$

$\frac{31}{9}$

$\frac{9}{31}$

3.2 Evaluating Algebraic Expressions

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