SOLUTION: The sum of two numbers is -9. One of the numbers minus twice the other number is 30. Find the two numbers

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Question 1087316: The sum of two numbers is -9. One of the numbers minus twice the other number is 30. Find the two numbers
Answer by MathLover1(20850) About Me  (Show Source):
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let two numbers be x and y
if the sum of two numbers is -9 we have:
x%2By=-9....solve for x
x=-9-y.....eq.1
if one of the numbers minus twice the other number is 30 we have:
x-2y=30....solve for x
x=30%2B2y..........eq.2
from eq.1 and eq.2 we have:
-9-y=30%2B2y....solve for y
-9-30=y%2B2y
-39=3y
-39%2F3=y
y=-13
find x
x=30%2B2y..........eq.2
x=30%2B2%28-13%29
x=30-26
x=4
so, your numbers are:-13 and 4