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Mathematics
Gretchen Pena
1 March, 09:35
If 4x-2y=10 and 7x+2y=23 what is the value of x
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Zander Lynn
1 March, 11:29
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4x-2y=10
7x+2y=23
First, we can solve one of the problems in order to come up with an expression to represent y.
-2y=4x+10
y=-2x-5
Now that we have our y value, we can plug it in to the other equation.
7x+2 (2x-5) = 23
7x+4x-10=23
11x=33
x=3
There's your x value, 3. I am going to solve for y as well just so that you can see how to check your work.
We can plug our x value into the other equation now to find y.
4 (3) - 2y=10
12-2y=10
-2y=-2
y=1
Would you look at that? We have both the x and y values. Now we can just plug them in to either equation.
7 (3) + 2 (1) = 23
21+2=23
23=23
23 indeed equals 23, therefore proving that both variables are correct. There you go!
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