If the point of intersection of the lines y = 3x + a and y + 2x = b is D(2,5). i) Find the values of a and b. a = b = ii) If the line y = mx + c is perpendicular to y + 2x = b and passes through the point E(6, 0), find the gradient m and the y-intercept c. m= C = iii) Find the coordinates of the midpoint of DE:

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