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Question

Line AB is parallel to line CD.
If x+(x+ Y)=320, what is x?
444330.png
  1. 120
  2. 140
  3. 100
  4. 150

A
150
B
120
C
100
D
140
Solution
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140o: Subtract the equation x + y = 180 from 2x +y =320 to eliminate y and solve for x:
2x+y=320
(x+Y=180)
________________
x=140
Don't forget to subtract each element in the second line.
Alternatively, because you know that x+y=180, you can substitute this into the given equation of x+(x+y)=320 to solve for x:
x+180=320
x=140

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