3x + 7y = 3*x + 7*y = 3*6 + 7*4 = 18 + 28 = 46
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y = -1 and x = -3
If you mean: x+7y = 39 and 3x-2y = 2 Then by substitution: x = 4 and y = 5
12y - 4 = 7y + 165y = 20y = 4
If: 3x-7y+4 = 0 then 3x-7y = -4 The intercepts are at: x is at (-4/3, 0) and y is at (0, 4/7) Distance of x from the origin: 4/3 Distance of y from the origin: 4/7 Area of the triangle: 1/2*4/3*4/7 = 8/21 square units
4(1-4x+7y)