Q31. - Algebra 1

Question

Evaluate each expression if $\mathit{a}\mathbf{=}\mathbf{-}\mathbf{1}\mathbf{,}\mathit{b}\mathbf{=}\mathbf{4}\mathbf{,}$ and $\mathit{c}\mathbf{=}\mathbf{6}$.

31. $\mathbf{4}\mathit{a}\mathbf{+}\mathbf{9}\mathit{b}\mathbf{-}\mathbf{2}\mathit{c}$

Step-by-Step Solution

Answer

The value of the expression is 20.

Step 1 – Write the given information

The expression given is

$4a+9b-2c$

And

$a=-1,b=4\text{ and }c=6$

Step 3 - DESCRIPTION OF STEP

To solve the given expression substitute variables a, b, and c by $-1$, 4, and 6 respectively, as:

$\begin{array}{c}4\left(-1\right)+9\left(4\right)-2\left(6\right)=-4+36-12\\ =32-12\\ =20\end{array}$

Thus, $4a+9b-2c=20$