Discussion

In the figure shown, if l||k, then what is the value of y?
(A)   20
(B)...
(C)...
(D)...
(E)...
(F)...
*This question is included in Nova Math - Problem Set J: Geometry, question #14

The solution is

Posted: 04/17/2014 09:11
I don't understand, how to solve the equation?
Posted: 04/17/2014 09:11
I don't understand, how to solve the equation?
Posted: 04/17/2014 09:11
I don't understand, how to solve the equation?
Posted: 04/17/2014 09:12
I don't understand, how to solve the equation?
Posted: 04/21/2014 13:48
Sam, if the line l is parallel to k, we know that the angle y is equal to the angle 2y-75. So we set y = 2y - 75, giving us y = 75.
Posted: 04/21/2014 21:05
How can
y=2y-75

Shouldn't y = 2x-75 or another variable other than y? Logically it doesn't make sense.

Sorry for the multiple posts of the same Q, my cell phone farted.
| Edit
Posted: 04/21/2014 23:07
Hi Sam. Well one angle is y, and the other is 2y-75, not 2x-75. So we set them equal to each other, and solve for y. If it contained another variable, we won't be able to solve for y.
| Edit

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