Consider the line 7x+4y−28=0. Answer the following:
(a) Part 1: (i) Rewrite the equation in the form y=mx+c and hence state the slope and the y-intercept.
(b) Part 2: (ii) Find the x-intercept of the line.
(c) Part 3: (iii) Sketch the line on a Cartesian plane, clearly indicating both intercepts.
(d) Part 4: (iv) The line together with the coordinate axes encloses a triangle in the first quadrant. Calculate the area of this triangle.
(e) Part 5: (v) A point P(t,0) is chosen on the x-axis such that the area of △OPQ is 42 square units, where O is the origin and Q is the y-intercept. Find the two possible values of t.