Ihave a question. in my class we are doing a new unit and i don't understand it. we are solving systems of equations by graphing. i don't understand how to graph each point for both equations and how they intersect each other.

there is an example:
{ x+y=8
x-y=4

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

In which form is the following function written? y = - 2(x – 3)(x + 5)

Type the correct answer in each box. spell all words correctly. a sequence of transformations maps ∆abc onto ∆a″b″c″. the type of transformation that maps ∆abc onto ∆a′b′c′ is a . when ∆a′b′c′ is reflected across the line x = -2 to form ∆a″b″c″, vertex of ∆a″b″c″ will have the same coordinates as b′.