If 3x +2y=7 and 3x-2y=5 then xy =?
Created: 2 years ago |
Updated: 7 months ago
best des
(3x + 2y) + (3x - 2y) = 7 + 5
This simplifies to:
6x = 12
Now, divide both sides by 6:
x = 12 / 6 x = 2
Now that you know the value of x, you can substitute it into one of the original equations to solve for y. Let's use the first equation:
3x + 2y = 7
3(2) + 2y = 7
6 + 2y = 7
Subtract 6 from both sides:
2y = 7 - 6 2y = 1
Now, divide both sides by 2:
y = 1 / 2
So, x = 2 and y = 1/2. Now, you can find the value of xy:
xy = 2 * (1/2) = 1
So, xy = 1.
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