Solving for an Expression in a Linear Equation
MathematicsLinear EquationsEasySTEM
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Question
If $7x + 21 = -2$, what is the value of $x + 3$ ?
A) $-5$
B) $-2$
C) $-\frac{5}{7}$
D) $-\frac{2}{7}$
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Step by Step Written Solution
1
Step 1
In this problem, we are given an equation and asked to find the value of the expression x plus three.
Problem Overview
2
Step 2
We are given the equation seven x plus twenty-one equals negative two.
$$7x + 21 = -2$$
3
Step 3
Notice that the left side of the equation, seven x plus twenty-one, can be factored by pulling out a seven.
4
Step 4
Now, observe that we have the exact expression x plus three sitting right inside those parentheses.
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