Posted by kaitlyn on Thursday, October 31, 2013 at 11:38am.
1. Write the equation for the horizontal line that contains point G(-8, 8).
2. What is an equation for the line that passes through points (-1, -4) and (1, 4)? Write the equation in slope-intersect form.
3. Write an equation for the vertical line that contains point E(10, -3).
- math (please help) - Jai, Thursday, October 31, 2013 at 12:07pm
Note that horizontal line has a zero slope, and in the form y = c, where c is a any real number.
Therefore, if it passes thru the point (-8,8), the equation must be y = 8.
If we are given the two points on the line, we first get the slope using the formula
m = (y2 - y1)/(x2 - x1)
where (x1,y1) and (x2,y2) are points on the line. Substituting,
m = (4 - (-4)) / (1 - (-1))
m = (4+4)/(1+1)
m = 4
Then we substitute it on the point slope formula:
y - y1 = m(x - x1)
y - 4 = 4(x - 1)
y = 4x - 4 + 4
y = 4x
Note that vertical line has a slope equal to infinity, and in the form x = c, where c is a any real number.
Therefore, if it passes thru the point (10,-3), the equation must be x = 10.
Hope this helps :3
- math (please help) - kaitlyn, Thursday, October 31, 2013 at 12:18pm
Thank You so much Jai
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