What is the solution of the system? Use the elimination method.

2x+y=206x−5y=12

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Me because some of question i don’t understand

Which value of y will make the inequality y< -1 false?

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b