(Linear Equation) solve by the Elimination method
3x-2y=11 (I)
x-4y=3

Is the open sentence 5x-2=3x+2 true when x=2? justify your answer.

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

Compare the subtraction problems 6/8 - 5/8 = 1/8 and 6/9 - 7/9 = 1/9 why is the answer to the first problem positive and the answer to the second problem negative