Use linear combinations to solve the system of linear equations.
-x-5y=30
2x-7y=25

Which is an equation for the nth terms of the sequence 12,15,18,21

Find the value of x. give reasons to justify your solutions! l, m ∈ kn

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field