The problem states that Noah is trying to solve the inequality $7x + 5 > 2x + 35$. He first solves the equation $7x + 5 = 2x + 35$ and finds that $x = 6$. The question asks how this solution helps Noah solve the inequality $7x + 5 > 2x + 35$.

AlgebraInequalitiesLinear InequalitiesSolving InequalitiesAlgebraic Manipulation
2025/3/25

1. Problem Description

The problem states that Noah is trying to solve the inequality 7x+5>2x+357x + 5 > 2x + 35. He first solves the equation 7x+5=2x+357x + 5 = 2x + 35 and finds that x=6x = 6. The question asks how this solution helps Noah solve the inequality 7x+5>2x+357x + 5 > 2x + 35.

2. Solution Steps

The solution to the equation 7x+5=2x+357x + 5 = 2x + 35, which is x=6x = 6, represents the point where the expressions 7x+57x + 5 and 2x+352x + 35 are equal. This point divides the number line into two intervals.
To solve the inequality 7x+5>2x+357x + 5 > 2x + 35, we need to determine for what values of xx the expression 7x+57x + 5 is greater than the expression 2x+352x + 35.
We know that at x=6x = 6, the two expressions are equal. So we need to test values on either side of x=6x = 6.
Let's test x=7x = 7 (a value greater than 6):
7(7)+5=49+5=547(7) + 5 = 49 + 5 = 54
2(7)+35=14+35=492(7) + 35 = 14 + 35 = 49
Since 54>4954 > 49, the inequality holds for x=7x = 7.
Let's test x=5x = 5 (a value less than 6):
7(5)+5=35+5=407(5) + 5 = 35 + 5 = 40
2(5)+35=10+35=452(5) + 35 = 10 + 35 = 45
Since 40<4540 < 45, the inequality does not hold for x=5x = 5.
Therefore, the solution to the inequality is x>6x > 6. The value x=6x = 6 is the boundary between the region where 7x+5>2x+357x+5 > 2x+35 and the region where 7x+5<2x+357x+5 < 2x+35. Solving the equation allows us to find this boundary point.

3. Final Answer

The solution to the equation 7x+5=2x+357x + 5 = 2x + 35, which is x=6x=6, helps Noah solve the inequality 7x+5>2x+357x + 5 > 2x + 35 by giving him the boundary point. He knows that the solution to the inequality will either be x>6x > 6 or x<6x < 6. He can then test a value in each interval to determine which interval contains the solution to the inequality. In this case, the solution to the inequality is x>6x > 6.

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