Answer:
Concept:
Here, we need to understand the idea of evaluation.
When encountering questions that gave you an expression with variables, then stated: "If x = a, y = b, z = c" (a, b, c are all constants), this means you should substitute the value given for each variable back to the expression.
Solve:
<h2>PART I: Find the value of -2ab</h2>
<u>Given information</u>
a = 5
b = 2
<u>Given expression</u>
-2ab
<u>Substitute values into the expression</u>
-2 (5) (2)
<u>Simplify by multiplication</u>
=-10 (2)
=
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<h2>PART II: Find the value of -3a + b</h2>
<u>Given information</u>
a = 5
b = 2
<u>Given expression</u>
-3a + b
<u>Substitute values into the expression</u>
-3 (5) + (2)
<u>SImplify by multiplication</u>
=-15 + (2)
<u>Simplify by addition</u>
=
Hope this helps!! :)
Please let me know if you have any questions