In the diagram ,AB and EC are perpendicular.

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

The value of x in this system of equations is 1. 3x + y = 9 y = –4x + 10 substitute the value of y in the first equation: combine like terms: apply the subtraction property of equality: apply the division property of equality: 3x + (–4x + 10) = 9 –x + 10 = 9 –x = –1 x = 1 what is the value of y?

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect