Example

Finding the Equation of a Line with Slope 1-1 and yy-Intercept (0,3)(0, -3)

To formulate the equation of a line given its slope and yy-intercept, substitute the specific values straight into the general slope-intercept form, y=mx+by=mx+b.

Given: slope m=1m = -1 and yy-intercept (0,3)(0, -3).

Step 1 — Identify the components. As given, the slope m=1m = -1 and the intercept value b=3b = -3.

Step 2 — Substitute into the formula.

y=1x+(3)y = -1x + (-3)

Step 3 — Simplify the resulting expression. Write 1x-1x simply as x-x and translate the addition of a negative value into subtraction:

y=x3y = -x - 3

The correct equation of the line is y=x3y = -x - 3. This emphasizes taking care to correctly simplify negative coefficients and constants in final linear models.

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Updated 2026-05-03

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