Equation of st.line

find equations: 1a)passing through (2,4)and with slope =3. b)passing through (-2,3)and(3,1) c)passing through(5,7)and with inclination 45。(angle) 2)Two points A(2,0) and B(4,4)are given.Find the mid-point of AB. 3)let L be a straight line joining A(2,5)andB(6,3).Find a)the slope of L b)the equation of L c)the... 顯示更多 find equations:
1a)passing through (2,4)and with slope =3.
b)passing through (-2,3)and(3,1)
c)passing through(5,7)and with inclination 45。(angle)

2)Two points A(2,0) and B(4,4)are given.Find the mid-point of AB.

3)let L be a straight line joining A(2,5)andB(6,3).Find
a)the slope of L
b)the equation of L
c)the equation of the line perpendicular to L at A

4)find the coordinates:
a)L1:y=3x+2
L2:y=2x+1
thx a lot~
更新: Extra(%):
a man bought an article for $x.The article for sale at a marked price 70% higher than its cost.The article was then sold to a customer at a discount of 5%.
a)wt was the percentage gain for the merchant by selling the article?
更新 2: b)if the customer paid $2907 for the article,find the value of x.
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