Pregunta
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Work each problem according to the instructions given. a. Evaluate when \( x=0:-2 x-7 \) b. Solve: \( -2 x-7=5 \) \( x=\square \) c. Is 0 a solution to \( -2 x-7 \geq 5 \) ? ? \( v \) d. Solve: \( -2 x-7 \geq 5 \)

Ask by Tran Sherman. in the United States
Feb 27,2025

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a. -7 b. x = -6 c. No d. x ≤ -6

Solución

a. Substitute x = 0 into the expression:   -2(0) - 7 = 0 - 7 = -7 b. Solve the equation -2x - 7 = 5:   Add 7 to both sides:    -2x = 5 + 7    -2x = 12   Divide both sides by -2 (remembering to reverse the inequality when dividing an inequality is applied, but here it’s an equation so no reversal is needed):    x = 12 / (-2)    x = -6 c. Check if 0 is a solution to -2x - 7 ≥ 5:   Substitute x = 0:    -2(0) - 7 = -7   Since -7 is not greater than or equal to 5, 0 is not a solution.   Answer: No d. Solve the inequality -2x - 7 ≥ 5:   Add 7 to both sides:    -2x ≥ 5 + 7    -2x ≥ 12   Divide both sides by -2 (reverse the inequality sign when dividing by a negative number):    x ≤ 12 / (-2)    x ≤ -6 Summary of answers:   a. -7   b. x = -6   c. No   d. x ≤ -6

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Beyond the Answer

Let's dive into your math problems! When you plug in \( x=0 \) into the expression \( -2x - 7 \), you get: \(-2(0) - 7 = -7\). So, the evaluation results in \(-7\). Now, for the equation \( -2x - 7 = 5 \), let’s solve it step by step: First, add 7 to both sides: \(-2x = 5 + 7\) \(-2x = 12\) Now, divide both sides by -2: \(x = -6\). Now, is 0 a solution to \( -2x - 7 \geq 5 \)? Substitute \( x=0 \): \(-2(0) - 7 \geq 5\) becomes \(-7 \geq 5\), which is false. So, 0 is not a solution! For solving \( -2x - 7 \geq 5 \): Start the same way as before: Add 7 to both sides: \(-2x \geq 5 + 7\) \(-2x \geq 12\) Now, divide both sides by -2, remembering to flip the inequality: \(x \leq -6\). So, you end up with pretty clear answers and inequalities! Happy solving!

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