1). What are the 2 techniques for solving a System of Equations using "Substitution"? 2). Name the 2 specific parts of a mathematical term that is super important when solving a Systems of Equations using "Elimination"?

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step-by-step explanation:

y= 2x+7

changed to y= 5x +7

as slope is increased from 2 to 5

therefore it would be less steeper

so, option d) is correct

you estimate that the angle of elevation to the top of the 86th floor (the observatory) is 82 .the total height of the building is another 123 meters above the 86th floor.

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its kinda hard to answer this when we dont have all the information that we need.