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It looks like you have 2 simultaneous equations with 2 variables:
4x + 8y = 20 and -4x + 2y = -30. Solution is {x=7, y = -1}.
One way to solve:
Add the two equations together, combining like terms: (4x - 4x) + (8y + 2y) = 20-30 --> 0 + 10y = -10 --> y = -1. Substitute this into either of the original equations and solve for x=7, then check in the other equation to make sure you calculated correctly.
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The formula for the perimeter of a rectangle is P equals 2W plus 2L with perimitor of 100 length 30?
P = 100 l = 30 w = 20
-30 x-10 plus 11x?
The equation -30 times -10 plus 11X equals -29. This is a math problem.
20 feet X 30 feet equals how many yards?
20' x 30' = 600 feet2 = 66.67 yards2
30ft x 20ft equals how many square feet?
30 ft * 20 ft = 30*20 sq ft = 600 sq ft
X2 plus 20x equals 30 solve by completing the square?
x2 + 20x +0 =30 [(20/2)2 =100] x2 + 20x + 100 =30 +100 √(x+10)2=√130 x+10=√130 x= −10+√130 √ means square root
How do you do 2x plus y equals -12 -4x-2y equals 30?
2x+y=-12-4x-2y=30 x=-y/2+30, you plug this into -12-4x-2y=30 and get -12+2y-120-2y=30 which gives 2y-2y=162. This is not possible, so the equation is unsolvable.
What is the slope intercept form of the equation 5x plus 2y equals 30?
5x+2y = 30 2y = -5x+30 y = -2.5x+15 Therfore the slope is 2.5 and y the intercept is 15.
What is 15 plus 20 plus 20 plus 20 plus 35 plus 30 plus 35 plus 30 equals?
205
2y plus 3y-7y plus 4 equals 16?
2y+3y-7y+4=16 -2y=12y=-6Check it-12-18+42+4=16-30+46=1616=16
What is 3a equals 30 plus 30?
a = 20
Solve this using substitution x plus 2y equals 30 x2 plus y2 equals 900?
x+2y = 30 => x= 30-2y x2+y2 =900 (30-2y)2+y2 = 900 (30-2y)(30-2y)+y2 = 900 900-60y-60y+4y2+y2 = 900 5y2-120y = 0 y(5y-120) = 0 y = 0 or y= 24 Substitute the value of y into the original equations to find the value of x: Therefore: x = -18 and y = 24 Check: -18+48 = 30 and (-18)2+242 = 900
What is -20 plus 30 equals?
10
How to find elimination method for 3x - 4y equals 30 and 3x plus 2y equals 6?
Subtract: 3x - 3x - 4y - 2y = 30 - 6 ie -6y = 24 so y = -4 and x = 14/3
5x plus 20 equals 4x plus 30?
5x + 20 = 4x +30 5x - 4x = 30 - 20 x = 10
What is the x and y coordinates of these equations y equals 3x and 4x plus 2y equals 30?
4x + 2(3x) = 30 10x = 30 x= 3. Y= 9. (3,9)
3y plus 5 equals y-25?
3y+5=y-25 2y=-30 y= -15
What is 10 plus 20 plus 30 plus 40 plus 50?
10 plus 20 plus 30plus 40 plus 50 equals 150 because 50 plus 40 equals 90 plus 30 =120+20= 140 then + 10 = 150
