QuestionAugust 26, 2025

2.Points A, B and C are collinear.Point B is between A and C. Find the length of BC. AB=9 AC=5x-1 BC=2x+2

2.Points A, B and C are collinear.Point B is between A and C. Find the length of BC. AB=9 AC=5x-1 BC=2x+2
2.Points A, B and C are collinear.Point B is between A
and C. Find the length of BC.
AB=9
AC=5x-1
BC=2x+2

Solution
3.9(185 votes)

Answer

10 Explanation 1. Set up the equation Since points A, B, and C are collinear and B is between A and C, AB + BC = AC. Substitute the given values: 9 + (2x + 2) = 5x - 1. 2. Simplify the equation Combine like terms: 11 + 2x = 5x - 1. 3. Solve for x Rearrange to isolate x: 11 + 1 = 5x - 2x, leading to 12 = 3x. Thus, x = 4. 4. Calculate BC Substitute x = 4 into BC = 2x + 2: BC = 2(4) + 2 = 8 + 2 = 10.

Explanation

1. Set up the equation<br /> Since points A, B, and C are collinear and B is between A and C, $AB + BC = AC$. Substitute the given values: $9 + (2x + 2) = 5x - 1$.<br />2. Simplify the equation<br /> Combine like terms: $11 + 2x = 5x - 1$.<br />3. Solve for x<br /> Rearrange to isolate $x$: $11 + 1 = 5x - 2x$, leading to $12 = 3x$. Thus, $x = 4$.<br />4. Calculate BC<br /> Substitute $x = 4$ into $BC = 2x + 2$: $BC = 2(4) + 2 = 8 + 2 = 10$.
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