Math Problem Statement

Which equation in standard form best represents the graph?

Solution

To determine which equation best represents the line on this graph, we need to identify the slope and y-intercept of the line and then check which equation in the answer choices matches it in standard form (Ax + By = C).

Step 1: Determine Two Points on the Line

The line crosses at two clear points:

  1. (-4, 10)
  2. (4, -1)

Step 2: Calculate the Slope

The slope mm can be calculated by: m=y2y1x2x1=1104(4)=118m = \frac{{y_2 - y_1}}{{x_2 - x_1}} = \frac{{-1 - 10}}{{4 - (-4)}} = \frac{{-11}}{{8}}

So, the slope m=118m = -\frac{11}{8}.

Step 3: Find the Equation in Point-Slope Form

Using the point-slope form, yy1=m(xx1)y - y_1 = m(x - x_1), with point (4,10)(-4, 10): y10=118(x+4)y - 10 = -\frac{11}{8}(x + 4)

Expanding this equation: y10=118x448y - 10 = -\frac{11}{8}x - \frac{44}{8} y=118x+208=118x+2.5y = -\frac{11}{8}x + \frac{20}{8} = -\frac{11}{8}x + 2.5

Step 4: Convert to Standard Form

To match the options, we convert y=118x+2.5y = -\frac{11}{8}x + 2.5 to standard form by eliminating the fractions: \

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Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Linear Equations
Standard Form

Formulas

Slope formula m = (y2 - y1) / (x2 - x1)
Point-Slope Form y - y1 = m(x - x1)
Standard Form Ax + By = C

Theorems

Equation of a Line

Suitable Grade Level

Grades 8-10