11x + 3y = 20
3x + y = 4
Using the two equations above, solve for x.

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- anonymous

11x + 3y = 20
3x + y = 4
Using the two equations above, solve for x.

- chestercat

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- anonymous

its either x = 7
x = 5
x = 4
x = 9

- anonymous

we-write 2nd equation as y=4-3x.
plug in thi into the 1st equation.
u get the x value.

- anonymous

i have no idea how to do the problem can u just give me the answer please (:

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## More answers

- anonymous

i better give u the way how to do it first. so u learn how to do problem like this. :)

- anonymous

okay, but idk what you mean by plug it in to the equation

- anonymous

idk how to do problems with two unknowns

- anonymous

u have y=4-3x. so u substitute the y in the 1st equation as 4-3x st:
11x + 3y = 20 ---> 11x + 3(4-3x) = 20
solve the new equation to get x

- anonymous

if u need to find both unknown.
like in this case, after u get the x, substitute the value of x into any of the equation, then solve it to get the value of y.

- anonymous

idk im just gonna guess i have no idea how to do it

- anonymous

it was 4 (:

- anonymous

i got it right

- anonymous

thanks

- anonymous

yes. x=4.

- anonymous

u r welcome.

- anonymous

You must understand what these equations represent. Suppose you are given two equations in this form and are asked to solve for x and y:
11x + 3y = 20 ---------------- equation 1
3x + y = 4------------------------equation 2
Equations 1 and 2 represent two straight lines on a graph which has an x axis and a y axis.
You are trying to find the point of intersection of these two lines on the graph. You can try it out using a graph paper and you will find the correct answer of the intersection point, namely (x,y)

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