Thread: Parallel/Perpendicular Lines

So here's the problem: passes through (-2,2), parallel to graph of -2x + y = 4. Then I graph the line that satisfies the condition, but what I really need to know is just how to figure out the slope.
Exams tomorrow... please help me!

Originally Posted by kiwifruit

So here's the problem: passes through (-2,2), parallel to graph of -2x + y = 4. Then I graph the line that satisfies the condition, but what I really need to know is just how to figure out the slope.

Parallel have the same slope.
So any line parallel to -2x + y = 4 looks like -2x + y = K.
Just substitute the values for x & y to find K.

Originally Posted by kiwifruit

So here's the problem: passes through (-2,2), parallel to graph of -2x + y = 4. Then I graph the line that satisfies the condition, but what I really need to know is just how to figure out the slope.
Exams tomorrow... please help me!

When lines are parallel, they have the same slope. [i.e. if the slope of one line is then line two has a slope of

When lines are perpendicular, its a little different. If line one has a slope of , then line two has a slope of