Question 1065498
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It's just a matter of knowing what the word "complementary" means.

When two angles are 'complementary' that means that when you add them
you get 90°.

So when you add m&#8736;1 and m&#8736;2 you get 90°.

m&#8736;1 + m&#8736;2 = 90°

So we substitute 2x-10 for m&#8736;1 and 8x+10 for m&#8736;2, and we get:

2x-10 + 8x+10 = 90

Solve that for x.  Then substitute what you get in 2x-10 and that will
give you m&#8736;1, and substitute what you get in 8x+10 and that will
give you m&#8736;2.

I'll bet you can do that all by yourself!

Edwin</pre></b></font>