Question

Can someone please check my work? Please? I would really appreciate it...
Question~
Solve the systems using the substitution method.
x - y = 0
3x + y = -4

Answer 1

My answer~
Solve one equation for either variable~
Y=0+x
In the other equation replace the variable from step 1 with what is equaled:
3x+(0+x)=-4
Solve the equation in step 2 for the other variable:
4x= -4 --- x= 4/-4 = -1
Substitute the value found in step 3 into equation in step 1:
Y=0+-1
Solve equation in step 4:
Y=-1
Write your answer as an ordered pair (x, y).
(4/-4, 0/-1)

Answer 2

What my teacher said was wrong~
when you move the x in the 1st equation, it isn't +x

Answer 3

why you plug y ase 0/-1 when it is -1?

Answer 4

Please reduce your answer. You end up with the coordinates of a point. Check these coordinates in the original equation. Is the resulting equation true or false?

What I'd do is actually similar to what you've already done.

Solving the first equation for y results in y=x.

Substituting this into the second equation results in 3x + (x) = -4.

Abby, please combine the 2 terms on the left. What equation do you obtain?

Answer 5

No need to insert " 0 " into either of these equations.

Answer 6

Your "In the other equation replace the variable from step 1 with what is equaled:
3x+(0+x)=-4" is fine; your inserting that ' 0 ' doesn't hurt, but doesn't help either.
Toss out the (0+x) and replace it with just " x "

Answer 7

@mathmale I changed the 3x+(0+x)=-4 to 3x+x=-4, is that all I have to fix?