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Rava

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set up a proportion. 4/6 = x/15 cross multiply. 60 = 6x solve. 10 = x so it should be 10" by 15"
ack. just remembered area of a triangle is (basexheight/2). that makes things easier, and Mary is right.
an ordered pair is always (x,y) and you have (0,4). so your x=0 and y=4. plug into your equation. (4)= 6 - 2(0) 4= 6-0 4=6 ==>this is false. is (0,4) a solution to y=6-2x? no.
okay, so the base of the triangle is (b). that means the height of the triangle will be (b+4). since the area of a triangle is (basexheight) and the area is already given as 22.5, then you can find (b) by plugging in the area formula. (b) x (b+4)= 22.5 b^2

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