If x + y+y=420 and x-y=90, Then x=
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To solve this system of equations, we need to eliminate one of the variables. Let's multiply the second equation by 2 to get rid of the variable y:
2(x - y) = 2(90)
2x - 2y= 180.
Now, let's substitute the value of x from the second equation into the first equation:
x + y + y = 420
90 + y + y = 420
90 + 2y = 420
2y = 420 - 90
2y = 330
y = 330/2
y = 165.
Finally, substitute the value of y back into the second equation to find x:
x - y = 90
x - 165 = 90
x = 90 + 165
x = 255.
Therefore, x = 255.
To solve this system of equations, we need to eliminate one of the variables. Let's multiply the second equation by 2 to get rid of the variable y:
2(x - y) = 2(90)
2x - 2y= 180.
Now, let's substitute the value of x from the second equation into the first equation:
x + y + y = 420
90 + y + y = 420
90 + 2y = 420
2y = 420 - 90
2y = 330
y = 330/2
y = 165.
Finally, substitute the value of y back into the second equation to find x:
x - y = 90
x - 165 = 90
x = 90 + 165
x = 255.
Therefore, x = 255.