Noah is solving the inequality $7x + 5 > 2x + 35$. He first solves the equation $7x + 5 = 2x + 35$ and finds $x = 6$. The question is how this helps him solve the original inequality.

AlgebraInequalitiesLinear InequalitiesSolving Inequalities
2025/3/25

1. Problem Description

Noah is solving the inequality 7x+5>2x+357x + 5 > 2x + 35. He first solves the equation 7x+5=2x+357x + 5 = 2x + 35 and finds x=6x = 6. The question is how this helps him solve the original inequality.

2. Solution Steps

Solving the equation 7x+5=2x+357x + 5 = 2x + 35 gives the point where the expressions 7x+57x + 5 and 2x+352x + 35 are equal. This is the boundary point.
To solve the inequality 7x+5>2x+357x + 5 > 2x + 35, we know that x=6x = 6 is the boundary point.
We need to test values on either side of x=6x = 6 to determine the solution to the inequality.
Test x=5x = 5:
7(5)+5>2(5)+357(5) + 5 > 2(5) + 35
35+5>10+3535 + 5 > 10 + 35
40>4540 > 45 (False)
Test x=7x = 7:
7(7)+5>2(7)+357(7) + 5 > 2(7) + 35
49+5>14+3549 + 5 > 14 + 35
54>4954 > 49 (True)
Therefore, the solution to the inequality is x>6x > 6.

3. Final Answer

The solution to the equation 7x+5=2x+357x + 5 = 2x + 35 gives the boundary point x=6x=6. We test values on either side of x=6x=6 to find the solution to the inequality 7x+5>2x+357x + 5 > 2x + 35. The solution is x>6x > 6.

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