Question 979790
A triangle ABO has an area of 6. Its vertices are A(-1,3), B(a,0), and O(0,0). Using this information, find a. 
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The points B and O are on the x-axis --> the base = a
B(-1,3) makes the height 3.
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Area = b*h/2 = 6
6 = 3*a/2
3a = 12
a = 4