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What is the answer to 4x plus 8y equals 20 and -4x plus 2y equals -30 by solving using elimination?
4x + 8y = 20-4x + 2y = -30First add equations 1. & 2. to get:(4x + -4x) + (8y + 2y) = 20 + -30⇒ 10y = -10⇒ y = -1Multiply equation 2. by 4 and subtract it from equation 1:4x + 8y = 20-16x + 8y = -120⇒ (4x - -16x) + (8y - 8y) = 20 - -120⇒ 20x = 140⇒ x = 7Solution x = 7, y = -1Alternatively, to find x, now that y is known to be -1:Substitute y = -1 into equation 1. to give:4x + 8(-1) = 20⇒ 4x -8 = 20⇒ 4x = 28⇒ x = 7The solution can be checked y substituting the values found for x and y in to equation 2. and checking it is the correct value:-4x + 2y = -4(7) + 2(-1)= -28 + -2= -30as required, so the solution is correct.
How do you solve 2y equals 4x plus 4?
2y = 4x + 4y = 2x + 2
What is 7 plus 8y-3y plus 2?
7 + 8y - 3y + 2 =7 + 2 + 8y - 3y = 9 + 8y - 3y = 9 + 5y
What is the answer for 4x plus 7 plus 3x equals 19 plus x?
X=2
2x plus 2 equals 4x-1?
2x + 2 = 4x -1 2x = 3 x = 1.5
Which equation has the same graph as 4x plus 8y equals 12?
There is no equation on the list you're showing that has the same graph as [ 4x + 8y = 12 ].
Factor 2xy - 4x plus 8y - 16?
( 2xy - 4x ) + ( 8y - 16)2 ( xy - 2x ) + 2 ( 4y - 8 ) Answer
What is 4x plus 8y equals 20 - -4x plus 2y equals -30?
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.
2xy - 4x plus 8y - 16?
2xy - 4x + 8y - 16 can be factored.(2xy - 4x) + (8y - 16)2x(y - 2) + 8(y - 2)Since y-2 is the same as the other, it would turn out like this:(2x + 8)(y - 2):]
4x plus 6y equals 14 -2x plus 2y equals -2?
(2, 1)
How do i find the Y-intercept of 4x plus 8y equals 24?
First, solve for y:4x + 8y = 24∴ x + 2y = 6∴2y = 6 - x∴ y = 3 - x/2Let y = 0:0 = 3 - x/2∴ x / 2 = 3∴ x = 6So the y-intercept occurs at the point (6, 0)
How do you solve 2y equals 4x plus 4?
2y = 4x + 4y = 2x + 2
What is the answer for 4x plus 7 plus 3x equals 19 plus x?
X=2
How do you solve x plus 2 equals -4x plus 7?
Add 4x - 2 to each side: 5x = 5 x = 1
4x-2 plus 5 equals 2x plus 8?
Simplify 4x + 3 = 2x + 8 2x = 5 x =2½
Y-5 equals 4x plus 2 in standard form?
4x-y+7=0
2x plus 2 equals 4x-1?
2x + 2 = 4x -1 2x = 3 x = 1.5
