Chapter 8: Q30. (page 406)

Evaluate the expression when $x = - 5$ and $y = - 7$ .
$3 x - 4 y$

Short Answer

Expert verified

Thevalue of given expression would be 13.

Step by step solution

Step 1. Given Information.

An expression: $3 x - 4 y$

Step 2. Calculation.

To find the value of the given expression, we will substitute $x = - 5$ and $y = - 7$ in our given expression as shown below:

$\begin{matrix} 3 x - 4 y = 3 (- 5) - 4 (- 7) (Substitutinggivenvalues) \\ = - 15 - 4 (- 7) (Usingproperty (-) (+) = (-)) \\ = - 15 + 28 (Usingproperty (-) (-) = (+)) \\ = 13 \end{matrix}$

Step 3. Conclusion.

The value of given expression would be 13.

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Evaluate the expression when $x = - 5$ and $y = - 7$ .
$3 x - 4 y$

Short Answer

Step by step solution

Step 1. Given Information.

Step 2. Calculation.

Step 3. Conclusion.

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Evaluate the expression when x=-5 and y=-7.3x-4y

Short Answer

Step by step solution

Step 1. Given Information.

Step 2. Calculation.

Step 3. Conclusion.

One App. One Place for Learning.

Most popular questions from this chapter

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Evaluate the expression when $x = - 5$ and $y = - 7$ .
$3 x - 4 y$