What is an equation of the line that passes through the points (-2, 1) and (4,7)

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Ineed i been stuck on this question since yesterday

Which of the following describes the graph of y--4x-36 compared to the parent square root function? stretched by a factor of 2, reflected over the x-axis, and translated 9 units right stretched by a factor of 2, reflected over the x-axis, and translated 9 units left stretched by a factor of 2, reflected over the y-axis, and translated 9 units right stretched by a factor of 2, reflected over the y-axis, and translated 9 units left save and exit next submit