E
Q12:
In the xy-plane, region R consists of all the points (x, y) such that 2x + 3y = 6. Is the point (r, s) in region R ?
(1) 3r + 2s = 6
(2) r = 3 and s = 2
請問一下這題怎麼算呢?
題目只有說線 怎麼行成region R ?
另外想請教一下 斜率怎麼算呢? 如果是—aX+bY+c=0
謝謝