Best Answer

3x + y = 4

x + y = 0

solve for y

y = -3x +4

y = -x

substitute y = -x into y = -3x +4, so the result is: -x = -3x +4

solve for x

-1x = -3x +4

+3x +3x

2x = 4

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2

x = 2

then plug the x-value into one of the bolded equations and solve for y.

I chose

y = -x

y = -(2)

y = -2

so the final answer is the ordered pair (2, -2)

Q: What is the solution for 3x plus y equals 4 and x plus y equals 0?

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x = 0

True because in both equations x = 0 or x = -4

2y + 3x = 0 2y + -3 = 0 2y = 0 + 3 , 2y = 3 y = 3/2 y = 1.5 x = -1

3x + 2 = 0 3x = -2 x = -2/3

According to my calculations, yes. 2x+8=3x+11 -8 2x=3x+3 -2x 0=x+3 -3 -3=x

Related questions

x = 0

True because in both equations x = 0 or x = -4

x2-5-4x2+3x = 0 -3x2+3x-5 = 0 or as 3x2-3x+5 = 0

2y + 3x = 0 2y + -3 = 0 2y = 0 + 3 , 2y = 3 y = 3/2 y = 1.5 x = -1

3x + 2 = 0 3x = -2 x = -2/3

x2 plus 3x plus 3 is equals to 0 can be solved by getting the roots.

According to my calculations, yes. 2x+8=3x+11 -8 2x=3x+3 -2x 0=x+3 -3 -3=x

6x+9=9-3x Bring x to the left side, while subtracting 3x and 9 from both sides 6x-3x=9-9 6x minus 3x equals to 3x 3x=9-9 9-9equals to 0, and 0 div. 3 is undefined x= undefined (you write it as a cross through a 0)

x = y = 0 ?

x2 + 3x - 10 = (x + 5)(x - 2) ⇒ x = -5 or 2

-2

5x = 3x+1000+0 5x-3x = 1000 2x = 1000 x = 500