Questions－飛航模式

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1.P(-4,-3n/2), Q(-m-1,-3) and R(3m+2,n/2) are three points on a rectangular coordinate plane. Find m and n if (a) PQ is paralled to the y-axis and anglePQR = 90 degree, (b) PR is paralled to the y-axis (point P is above point R) and the distance between P and R is 12 units.2. What is 'gas... 顯示更多 1.P(-4,-3n/2), Q(-m-1,-3) and R(3m+2,n/2) are three points on a rectangular coordinate plane. Find m and n if (a) PQ is paralled to the y-axis and anglePQR = 90 degree, (b) PR is paralled to the y-axis (point P is above point R) and the distance between P and R is 12 units. 2. What is 'gas pressure' and 'density'?(Plx use Chinese to explain this question) Thx!!

最佳解答:

1a) PQ is paralled to the y-axis x-coord. of P = x-coord. of Q = -4 -m - 1 = -4 m = 3 anglePQR = 90 QR is paralled to the x-axis y-coord. of R = y-coord. of Q = -3 n/2 = -3 n = -6 1b) PR is paralled to the y-axis x-coord. of P = x-coord. of R = -4 3m + 2 = -4 m = -2 distance between P and R = -3n/2 - n/2 = 12 ------------ (point P is above point R) n = -6 2) 'gas pressure' = 氣壓 density = 密度

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