SOLUTION: Solve this, and get a thank-you message! 1.{{{ y=2x}}} {{{x+y=-18}}} 2.{{{x=3y-1}}} {{{x+2y=9}}}

Algebra ->  Equations -> SOLUTION: Solve this, and get a thank-you message! 1.{{{ y=2x}}} {{{x+y=-18}}} 2.{{{x=3y-1}}} {{{x+2y=9}}}       Log On


   

Question 1108204: Solve this, and get a thank-you message!
1.+y=2x
x%2By=-18
2.x=3y-1
x%2B2y=9

Answer by addingup(3677) About Me  (Show Source):
You can put this solution on YOUR website!
1)
x + y = -18 and y = 2x, so:
x + 2x = -18
3x = -18
x = -6
and y = 2x; y = 2(-6), y = -12
x = -6
y = -12
Check: x + y = -18; -6 + (-12) = -18 Correct
----------------------------
2)
x = 3y - 1
x + 2y = 9 since x = 3y - 1:
3y - 1 + 2y = 9
5y = 10
y = 2
and x = 3y - 1 = 3(2) = 5
y = 2
x = 6
Check: x + 2y = 9; 5 + 2(2) = 9 Correct