Question 1164530
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<pre>

In case (a),  x + (4x-30) = 90  degrees.


In case (b),  x + (4x-30) = 180  degrees.


You do the rest.
</pre>

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At this point, I completed my instructions.


On complementary/supplementary angles and millions associated solved problems (your templates) see the lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Angles/Angles-basics.lesson>Angles basics</A> 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/word/geometry/How-to-solve-problems-on-suppl-compl-or-vertical-angles-Examples.lesson>HOW TO solve problems on supplementary, complementary or vertical angles - Examples</A>

in this site.


Learn the subject from there (!)