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15. Find the equation of the line that passes through (2, 3) and has a slope of -4.

Sagot :

To find the equation of the line that passes through the point (2, 3) and has a slope of -4, we can use the point-slope form of the equation of a line. The point-slope form is given by:

[tex]\[ y - y_1 = m(x - x_1) \][/tex]

Where:
- [tex]\( (x_1, y_1) \)[/tex] is a point on the line (2, 3)
- [tex]\( m \)[/tex] is the slope of the line (-4)

Let's go through this step-by-step:

1. Identify the given values:
- Point [tex]\((x_1, y_1) = (2, 3)\)[/tex]
- Slope [tex]\( m = -4 \)[/tex]

2. Substitute the values into the point-slope form:
[tex]\[ y - 3 = -4(x - 2) \][/tex]

3. Simplify the equation:
- Distribute the slope [tex]\(-4\)[/tex] on the right-hand side:
[tex]\[ y - 3 = -4x + 8 \][/tex]

- To isolate [tex]\( y \)[/tex], add 3 to both sides of the equation:
[tex]\[ y = -4x + 8 + 3 \][/tex]

[tex]\[ y = -4x + 11 \][/tex]

So, the equation of the line in slope-intercept form [tex]\(y = mx + b\)[/tex] is:

[tex]\[ \boxed{y = -4x + 11} \][/tex]

This equation represents the line that passes through the point (2, 3) with a slope of -4.