更新1:
solve for y
how do i solve 3/4(x+2y)=z?
回答 (9)
2008-11-03 6:28 am
✔ 最佳答案
in terms of a variable?
2008-11-03 6:06 pm
3/4(x + 2y) = z
3(x + 2y)/4 = z
3(x + 2y) = 4(z)
3(x + 2y) = 4z
x + 2y = 4z/3
2y = 4z/3 - x
y = (4z/3 - x)/2
y = (4z/3)/2 - x/2
y = (4z/3)(1/2) - x/2
y = 2z/3 - x/2
3(x + 2y)/4 = z
3(x + 2y) = 4(z)
3(x + 2y) = 4z
x + 2y = 4z/3
2y = 4z/3 - x
y = (4z/3 - x)/2
y = (4z/3)/2 - x/2
y = (4z/3)(1/2) - x/2
y = 2z/3 - x/2
2008-11-03 2:44 pm
all u have to do is solve for y so:
3/4(x+2y)=z
3/4x+3/4(2y)=z
.75x+1.5y=z
.75x-.75x+1.5y=z-.75x
1.5y=z-3/4x
1.5y/1.5=(z-.75x)/1.5
y=z/1.5-0.5x
3/4(x+2y)=z
3/4x+3/4(2y)=z
.75x+1.5y=z
.75x-.75x+1.5y=z-.75x
1.5y=z-3/4x
1.5y/1.5=(z-.75x)/1.5
y=z/1.5-0.5x
2008-11-03 2:40 pm
3/4(x+2y)=z
distribute the 3/4 inside the parenthesis
3/4x + 1.5y = z
subtract 3/4x from both sides
1.5y = z - 3/4x
divide both sides by 1.5
y = 2/3z - 1/2x
distribute the 3/4 inside the parenthesis
3/4x + 1.5y = z
subtract 3/4x from both sides
1.5y = z - 3/4x
divide both sides by 1.5
y = 2/3z - 1/2x
2008-11-03 2:30 pm
it also equal 3x+6y=4z
2008-11-03 2:28 pm
For three variables you would need three equations.
2008-11-03 2:27 pm
you need more info. is x, y, or z equal to anything in the given information?
2008-11-03 2:25 pm
You can't solve this equation
2008-11-03 2:24 pm
it equals (3x+6y)/4=z
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