Evaluating Expressions Practice Question

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Algebra expression 5x -7y
Question 1
Evaluate the following expression when x= 2 and y= -3.

Answer

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A. 31
B. -29
C. -11
D. 11
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Step by Step Solution 

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Step 1
First, substitute x with 2. Remember to put brackets around 2.
Substitute x with 2
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Step 2
Now, multiply 5 with 2. You will get 10.

The expression is now 10 -7y.
Multiply 5 with 2 to get 10
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Step 3
Next, substitute y with -3. Remember to put  brackets around -3.
Substitute y with -3
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Step 4
Now, multiply -7 with -3. You will get +21.

The expression is now 10 +21.
Multiply -7 with -3 to get +21
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Step 5
Finally, add 10 with 21. This gives 31. Therefore, the answer is A.
Add 10 with 21. This gives 31.
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