x+y=3 3x+y=11?

Answer 1

solve for y in the second equation: y = 11-3x.

substitute this value into the first equation: x + (11-3x) = 3

Solve for x and you get x = 4

than plug that back in to either equation to get y = -1.

Hope this helps

Answer 2

x= 4
y = -1

Answer 3

x+y=3 --------- (1)
3x+y=11-------(2)

(1) - (2) :-

x + y = 3
-(3x + y = 11)
-2x=-8
x=4

when x=4
therefore,
4 + y = 3
y = 3 - 4
y = -1

therefore, the value of x = 4 and value of y = -1

Answer 4

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Answer 5

x+y=3 --------(1)
3x+y=11 --------------(2)
we have the coefficients of y equal. So, we can subtract equations
3x+y=11
but we want to subtract. Hence, -(x+y=3)
-x-y=-3
Now subtract
3x+y=11
-x -y=-3
2x =8
x=8/2
x=4 ---------------value(1)

Substitute x=4 in equation (1)
x+y=3
4+y=3
y=3-4
y=(-1) ----------------value (2)

Ans. The solution of the equations is x=4 and y=(-1)

Answer 6

I) (x+ y = 3
II) (3x + y = 11

I) x = 3 - y
II) 3(3 - y) + y = 11
9 - 3y + y = 11
-2y = 11 - 9
-2y = 2
y = 2 : -2
y = -1
x = 3 - y
x = 3 - (-1)
x = 4
Solution: {x and y belong to R| x = 4 and y = -1}
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Answer 7

x+y=3 -(1)
3x+y=11 -(2)
multiplying (1) by 3 we get
3x+3y=9 -(3)
subtracting (3) by (2),
3x+y=11
-3x+3y=9
-------------
-2y=2
therefore,y= -1
substituting y= -1 in equation (1) we get,
x+(-)1=3
x=3+1
x=4
therefore x=4 & y=(-1)

Answer 8

x+y = 3 ----------1
3x+ y=11--------2
subtractig the equation 1 from eq. 2
2x = 8
x =4
substituting the value of x in eq1
4+y=3
y= 3 - 4 = -1

Answer 9

Just subtract the first equation from the second
to get 2x = 8
x = 4
y = -1

Answer 10

x + y = 3
y = 3 - x ______ (1)
Sub. (1) into (2)
3x + y = 11_______ (2)

3x + (3 - x) = 11
2x = 8
x = 4

Sub x = 4 into (1)
4 + y = 3
y = -1