Question

Difficulty: MediumSolving Linear Inequalities

What is the greatest integer value of kk that satisfies the inequality 83(2k5)4(k+6)8 - 3(2k - 5) \geq 4(k + 6)?

Answer: -1

Answer

The greatest integer value of kk that satisfies the inequality is 1-1.
Solving the inequality step-by-step yields k0.1k \leq -0.1. The greatest integer less than or equal to 0.1-0.1 is 1-1.

Step-by-Step Solution

1
Distribute the coefficients to remove parentheses
86k+154k+248 - 6k + 15 \geq 4k + 24
Expanding the terms makes it possible to combine like terms on each side of the inequality.
2
Combine like terms on the left side
236k4k+2423 - 6k \geq 4k + 24
Simplifying the constant values on the left side (8+15=238 + 15 = 23) simplifies the expression.
3
Subtract 4k4k from both sides
2310k2423 - 10k \geq 24
This groups all the variable terms on the left-hand side.
4
Subtract 2323 from both sides
10k1-10k \geq 1
This isolates the variable term on the left-hand side.
5
Divide by 10-10 and flip the inequality sign
k0.1k \leq -0.1
Dividing both sides by a negative number requires reversing the direction of the inequality sign.
6
Identify the greatest integer satisfying the inequality
k=1k = -1
The largest integer that is less than or equal to 0.1-0.1 is 1-1.

Key Concept

Solving linear inequalities and applying the sign-flip rule when dividing by a negative number.
Estimated Time:1m 30s
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