Answer to Question #22890 in Trigonometry for Kristen Woods
Write an equation for the line in point/slope form and slope/intercept form that has the given condition.
6. Passes through (3,2) and is parallel to 2x-y=4
7. Passes through (-1,-1) and is perpendicular to y=5/2x+3
The equation of the line is: - in point/slope form y-y1=m(x-x1), where (x1,y1) - point on this line and m - slope of this line; - in slope/intercept form y=mx+b, where m - slope of this line and (0,b) - coordinates of y-intercept 6. For this case: if two lines are parallel then their slopes are the same => m=2 and (x1,y1) = (3,2) The equation for this line in point/slope form is y-2=2(x-3) To get slope/intercept equation we have to transform the point/slope equation to form y=mx+b: y-2=2(x-3) y=2x-6+2 y=2x-4 7. Similarly to previous case we have: - in point/slope form: y+1=-2/5(x+1), 'cause for two perpendicular lines m1=-1/m2, where m1 and m2 are the slopes of its lines; - in slope/intercept form: y=-(2/5)x-2/5-1 y=-(2/5)x-7/5.