SOLUTION: 3x+y=7 -4x-y=7 If they say solver for x and y, What are the steps inorder to solve for x and y?

Question 97777: 3x+y=7
-4x-y=7
If they say solver for x and y, What are the steps inorder to solve for x and y?
Answer by Msgenes(10) (Show Source): You can put this solution on YOUR website!
You solve this problem using the addition method so that one of the variables cancels out. In this case the problem is already set up so that one of the variables cancels out and that variable is y.
3x + y = 7
-4x - y = 7
............
-x = 14
Now that we have x by its self it can not be a negative. So we divid -1 on both sides.
-x = 14
.......
-1 -1
x = -14
Now that we have x we can find out what y is. I will use the first equation it does not matter which one you use to find y but the first equation involves less steps.
3x + y = 7
3(-14) + y = 7
-42 + y = 7
Now again we want y by it self and we do that by adding 42 to both sides.
-42 + 42 + y = 7 + 42
y = 49
The solution is (-14,49).
RELATED QUESTIONS
solve the following equations for x and y. 1.x+y=25 y=4x 2.x=y+8 2x+y=52 5.... (answered by benni1013)

Solve the system of equation for x and y (3x+y)=7(y-x)... (answered by flame8855)

Solve the following system for x and y. 3x - y = 7 x + 2y =... (answered by jim_thompson5910)

4x + y = 7 and 3x - y = 7 then x + y =... (answered by edjones)

Use substitution to solve for x and y 4x - y = -7 2x + 2y =... (answered by jai_kos)

Solve for x or y and make the system equal to each other and solve: 2x+y=7 3x-y+3 (answered by JBarnum)

what are the steps and some example. For Soling systems of equations. like y+x=4... (answered by elima)

Can you solve for x and y... (answered by checkley77)

hey i need help for my math and please also show the steps. Thanks =) 1. 6x+7=-14y... (answered by checkley77)