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3 votes
4y-x=2x-4=x+y
solve for x

2 Answers

6 votes

Answer:

a system of equations , as below

Explanation:

4y-x

2x-4

x+y

use any two of the above to find a formula for one of the variables since they are all equal to each other.. btw.. it makes it much easier .. that they are all equal. :)

2x-4=x+y ⇒ x-4=y use this to plug into the y in the top formula

4(x-4)-x=2x-4 ⇒ 4x-16-x=2x-4 ⇒ 3x-16=2x-4 ⇒ x=12 yay! ;) now plug in 12 for x

2(12)-4=(12)+y ⇒ 24-4 = 12 +y ⇒ 8=y yay ! now we have both x and y

x=12

y= 8

this checks by plugging in the two number found for x & y (btw I had to try this about 4 times ) :P I kept messing up the algebra which is soooo easy to mess up.

User Roger Lindholm
by
7.0k points
2 votes
X=12






Explanation: in the photo
4y-x=2x-4=x+y solve for x-example-1
User Hojoon
by
6.7k points