Which equation is in standard form?

3x+4y=103x+4y=10

19+3y=2x19+3y=2x

7y−7x=87y−7x=8

8+5x=3y

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Louis wants to carpet the rectangular floor of his basement.the basement has an area of 864 square feet.the width of the basement is 2/3 it's length. what is the length of louis's basement

What is the slope of the line that contains the points (-2,1) and (0,-3)