book Maths Puzzle Numerical Ability

how do we solve the intersection pt (x,y) of d following equations/lines

20x + 20y >= 250
15x + 25y >= 375
18x + 12y >= 200

these three lines will intersect at a point, wha

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book Other Question

find the slope of a line that is parallel to and slope of a line that is perpendicular to : y=8

Thanks a Ton!! Calculate the value of (b� - 4ac) in the equation "9x� + 12x + 16 = 0" and state how many real solutions this equation has. What are they?