please help, i'm so stuck!!!!!!!!!!!
2007-01-27 08:18:04 · 12 answers · asked by enGlish_staLLiON 1 in Education & Reference ➔ Homework Help
5x + 2y = 4
2y= -5x + 4
y = -5/2x + 4
THis is how you solve for you. I am not sure what you needed to solve for but this was the best I could do
2007-01-27 08:22:46 · answer #1 · answered by Anonymous · 0⤊ 0⤋
One way to do this is to convert it into slope-intercept form (y = mx + b). First, move the 5x to the left of the equation by subtraction. Now the equation would lok like this: 2y = -5x + 4. Next, divide both sides of the equation by 2. The result looks like this: y = -5/2 x + 2. Lastly, choose at least 2 values for x (I make my kids choose 3 to make sure they haven't made a dumb math mistake), and solve the equation for y. The answer is a line with a slope of -5/2, and a y-intercept of 2.
2007-01-27 16:31:07 · answer #2 · answered by TQTX37A 4 · 0⤊ 0⤋
since you only have one equation, you will have to use a graph to solve the problem. For instance use 0 for x you get 2y=4 and by dividing both sides by 2 you get y=2 and x=0 and you would graph that on your graph. Then use x=1 which would make 5+2y=4, subtract 5 from both sides you get 2y=-1, divide both side by 2 and you get y=-1/2 when x =1. You just keep going to add as many points as your teacher wants by putting in a value for x and solve for y.
2007-01-27 16:29:13 · answer #3 · answered by elhouck 1 · 0⤊ 0⤋
What are you solving for?
If x then 5x=4-2y
then x=4-2y all divided by 5
if you are solving for y then 2y=4-5x
then y=4-5x all divided by 2
2007-01-27 16:23:11 · answer #4 · answered by Jennifer B 2 · 0⤊ 0⤋
Technically you can not solve that equation for a unique answer since there are an infinite number of solutions.
(if x = 1, y = -.5)
(if x= 2 , y= -3) and so on
This is a linear equation that will plot as a single line. You need another paired equation to have a unique solution where the two lines will cross)
So.. for now you can only solve for x in terms of y and y in terms of x
.
2007-01-27 17:18:42 · answer #5 · answered by ca_surveyor 7 · 0⤊ 0⤋
One easy way is to use substitution.
5x+2y=4
2y=4-5x
y=4-5x/2
5x+2(4-5x/2)=4
X=0
Plug X into the original formula and you get that Y=2
2007-01-27 16:25:41 · answer #6 · answered by operaphantom2003 4 · 0⤊ 0⤋
5x+2y=4
5x=4-2y
x=(4-2y)/5
2007-01-27 16:31:51 · answer #7 · answered by michaelas920 1 · 0⤊ 0⤋
As you have two unknowns (x and y) you need two equations if you are going to be able to work out the values of x and y
2007-01-28 14:57:06 · answer #8 · answered by Emma C 4 · 0⤊ 0⤋
wow, y do people have tomake it soooo hard, just do the inverse instead of 5x + 2y do subtraction
2007-01-31 12:54:22 · answer #9 · answered by Anonymous · 0⤊ 0⤋
The solution is a line. y = -2.5x + 2.
So its gradient is -2.5 and intercept is +2.
2007-01-27 16:23:40 · answer #10 · answered by Anonymous · 0⤊ 0⤋