help please?

label Mathematics
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Screen%20Shot%202014-08-05%20at%209.48.2
Aug 6th, 2014

7+14=180     because 8 and 14 are congruent and 7 and 8 are supplementary

so: substitute: 5x-4+8x-11=180

13x-15=180

13x=195

x=15

Aug 6th, 2014

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Aug 6th, 2014
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Aug 6th, 2014
Sep 20th, 2017
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