Equations of Linear Relations Lesson #3
Writing Equations using y – y1 = m(x – x1)
- To determine the equation of a line in future math courses, the point – slope equation, y – y1 = m(x – x1), is used more frequently than the slope – y – intercept equation, y = mx + b.
Q. The slope of a line end a point on the line are given. Determine the equation of the line in slope y-intercept form.
A. y= 2/3x – 12
Equations of Linear Relations Lesson #4
The General Form Equation Ax + By + C =0
- Given the equation of a line in general form, Ax + By + C =0, the slope and y – intercept can be found by converting the equation into slope y – intercept form, y = mx + b.
Ex) 2x – 3y + 12 =0
2x : always positive
2x – 3y + 12 : all integer values
Q. Determine the equation of a line which is perpendicular to the line 2x – 6y + 6 =0 and has same y-intercept.
A. 3x + y – 1 =0
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