Solve the system of equations using substitution. y = 2x – 10 y = 4x – 8

This equality are equal so2x-10=4x-8
-2=2x
X=-1

X=y+4 is the answe

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.