Solve. check for extraneous solutions sqrt x+7-x=1

I'll give brainliest if you answer right : )

Which statements are true? check all that apply. the line x = 0 is perpendicular to the line y = –3. all lines that are parallel to the y-axis are vertical lines. all lines that are perpendicular to the x-axis have a slope of 0. the equation of the line parallel to the x-axis that passes through the point (2, –6) is x = 2. the equation of the line perpendicular to the y-axis that passes through the point (–5, 1) is y = 1.

Explain how you can find the missing fraction in 3 4/5 / (blank) 2 5/7. then find the missing fraction.