In the rectangular coordinate system, what is the x-intercept of a line passing through (10, 3) and (−10, −7)?  Choose the correct choice from the following answers
A) 4 B) 2 C) 0 D) − 2 E) − 4

Rationale: "slope = rise / run = 10 / 20 = 1 / 2 the equation of the line is y = ( 1 / 2 ) x + b 3 = ( 1 / 2 ) ( 10 ) + b b = - 2 the equation of the line is y = ( 1 / 2 ) x - 2 to find the x - intercept , let y = 0 : 0 = ( 1 / 2 ) x - 2 x = 4 the answer is a ."
Answer: A