SOLUTION: Please show me how to use the substitution method to solve this system of equations. 3x-11y=2 x-5y=2 Thanks

Algebra ->  Expressions-with-variables -> SOLUTION: Please show me how to use the substitution method to solve this system of equations. 3x-11y=2 x-5y=2 Thanks      Log On


   



Question 176262: Please show me how to use the substitution method to solve this system of equations.
3x-11y=2
x-5y=2
Thanks

Found 2 solutions by EMStelley, MathTherapy:
Answer by EMStelley(208) About Me  (Show Source):
You can put this solution on YOUR website!
3x-11y=2
x-5y=2
The substitution method involves using one equation to solve for one of the variables, and then substituting back in to the other equation. For example, in the second equation we can easily solve for x by adding 5y to both sides, obtaining
x=5y%2B2
Now, we replace the x in the first equation with 5y+2,
3%285y%2B2%29-11y=2 and solve for y
15y%2B6-11y=2
4y=-4
y=-1
To find x, we plug in y=-1 into either equation. I will use the second one for simplicity:
x-5%28-1%29=2
x%2B5=2
x=-3
So the solution is (-3,-1).

Answer by MathTherapy(10555) About Me  (Show Source):
You can put this solution on YOUR website!
3x - 11y = 2
x - 5y = 2
x = 5y - 2
Substituting this value for x in equation 1, we get:
3(5y + 2) - 11y = 2
15y + 6 - 11y = 2
4y = - 4
y = - 1
x - 5(-1) = 2
x + 5 = 2
x = - 3
Solution: (- 3, - 1)