0
x + y = 8
2x - y = 5
-------------------- add together to eliminate y
3x = 13
x = 13/3
Substitute for x in one of the original equations:
(13/3) + y = 8
y = 24/3 - 13/3
y = 11/3
x=13/3 & y=11/3
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∙ 12y ago
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Does -8 plus plus 3 equals -5?
Yes, -8 plus plus 3 equals -5. The "plus plus" is equivalent to a positive sign, so -8 plus (+3) equals -5.
When x-y equals 7 and xy equals 8 find the value of x square plus y square?
x2 + y2 = x2 - 2xy + y2 + 2xy = (x - y)2 + 2xy = 72 + 2*8 = 49 + 16 = 65 You could, instead, solve the two equations for x and y and substitute, but the above method is simpler.
2 plus 3 equals 8 3 plus 7 equals 27 4 plus 5 equals 32 5 plus 8 equals 60 6 plus 7 equals 72 7 plus 8 equals what?
89
What plus 13 equals -8?
5
How do you solve 8 plus x2y?
i don't get that if it is 2xy +8 or 8 + 2xy then you can't solve or simplify it any further if it were 8 x 2y then you time the 8 by the 2 to get 16y
When x-y equals 7 and xy equals 8 find the value of x square plus y square?
x2 + y2 = x2 - 2xy + y2 + 2xy = (x - y)2 + 2xy = 72 + 2*8 = 49 + 16 = 65 You could, instead, solve the two equations for x and y and substitute, but the above method is simpler.
Does -8 plus plus 3 equals -5?
Yes, -8 plus plus 3 equals -5. The "plus plus" is equivalent to a positive sign, so -8 plus (+3) equals -5.
8 plus 7 plus 5 equals plus 8 equals?
it is 28
2 plus 3 equals 8 3 plus 7 equals 27 4 plus 5 equals 32 5 plus 8 equals 60 6 plus 7 equals 72 7 plus 8 equals what?
89
What plus 13 equals -8?
5
How do you solve 8 plus x2y?
i don't get that if it is 2xy +8 or 8 + 2xy then you can't solve or simplify it any further if it were 8 x 2y then you time the 8 by the 2 to get 16y
What is 8 plus 5 plus 4?
"8 plus 5 plus 4 equals 17."
What is 8 plus 8 plus 1 plus 5 equals?
22
5 plus 8 equals?
5+8 = 13
A plus 5 plus 8 equals 20?
A = 77 + 5 + 8 = 20
If 5 plus 3 equals 28 9 plus 1 equals 810 8 plus 6 equals 214 5 plus 4 equals?
19
Positive 8 - positive 5 equals 8 plus?
positive 8 - positive 5 = 8 plus negative 5 8 - 5 = 8 + (-5)
