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How do you graph x2 plus 10x plus y2 plus 20y - 19 equals 0?
x2 + 10x + y2 + 20y - 19 = 0 x2 + 10x + y2 + 20y = 19 Complete the squares on the LHS: x2 + 10x + 25 + y2 + 20y + 100 = 19 + 25 + 100 = 144 Simplify LHS: (x + 5)2 + (y + 10)2 = 122 This is the equation of all points whose distance form the point (-5, -10) is 12 units. That is, the circle with centre (-5, -10) and radius = 12 units.
What is the Answers to 4(2x plus 5y)?
8x + 20y
How do you solve 8x plus 20y equals -80?
It is a straight line equation that needs to be rearranged into slope-intercept form as follows:- 8x+20y = -80 20y = -8x-80 y = -0.4x-4
Friday jeans were sold at 25 a pair and shirts at 18 each Receipts totaled 441. On Saturday the store priced both items at 20 sold exactly the same number of each item and had receipt of 420.?
Yes, it is. If we denote with x the number of jeans that were sold, and with y the number of shirts that were sold, and create a system equations we will find: 25x + 18y = 441 20x + 20y = 420 Solve this system 4(25x + 18y) = 4(441) -5(20x + 20y) = -5(420) 100x + 72y = 1764 -100x - 100y = - 2100 -28y = -336 y = 12 shirts were sold in each day 20x + 20(12) = 420 20x + 240 = 420 20x = 180 x = 9 pair jeans were sold in each day
How do you solve 12y-4 equals 7y plus 16?
12y - 4 = 7y + 165y = 20y = 4
