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In the figure, lines l and m are parallel. If y – z = 60, th
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21 Sep 2018, 11:54
21 Sep 2018, 11:54
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88% (01:15) correct
11% (01:44) wrong based on 71 sessions
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In the figure, lines l and m are parallel. If y – z = 60, then what is the value of x ?
(A) 60
(B) 75
(C) 90
(D) 120
(E) 135
Re: In the figure, lines l and m are parallel. If y – z = 60, th
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25 Sep 2018, 19:34
25 Sep 2018, 19:34
1
Y and Z are angles on a straight line hence,
y+z = 180
we are also given y-z = 60
adding the two eqn we get,
2y = 240
or, y = 120
angle Y and angle s are vertically opposite therefore,
y=s=120
Given l and m are parallel lines angle s = angle x because they are alternate angles
hence x =120
y+z = 180
we are also given y-z = 60
adding the two eqn we get,
2y = 240
or, y = 120
angle Y and angle s are vertically opposite therefore,
y=s=120
Given l and m are parallel lines angle s = angle x because they are alternate angles
hence x =120
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In the figure, lines l and m are parallel. If y – z = 60, th
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01 Apr 2020, 07:42
01 Apr 2020, 07:42
Carcass wrote:
Attachment:
#GREpracticequestion In the figure, lines l and m are parallel.jpg
In the figure, lines l and m are parallel. If y – z = 60, then what is the value of x ?
(A) 60
(B) 75
(C) 90
(D) 120
(E) 135
Key concept: When a line (aka transversal) intersects two parallel lines, we get the following equal angles:
So, from the given diagram....
....we can see that x = y
So, let's find the value of y
Does angles on a line add to 180 degrees, we can conclude that y + z = 180
We are also told that y – z = 60
When we ADD these two equations together we get: 2y = 240
Divide both sides by 2 to get: y = 120
Since we already concluded that x = y, we can now say x = 120
Answer: D
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