the sum of two integers is -23. if the sign of one integer is changed, the new sum will be -3. what are the two integers? which integer will have its sign changed?
please help!
2007-02-12 11:36:21 · 4 answers · asked by Anonymous in Education & Reference ➔ Homework Help
-10 and -13
-10 is switched to 10
-10 + (-13) = -23
10 + (-13) = -3
2007-02-12 11:45:47 · answer #1 · answered by Adam 2 · 0⤊ 0⤋
Here are the formulae:
X + Y = -23
X + (-Y) = 3 or X - Y = 3 or X = 3+Y
Subtituting this value for X into the first equation we get
3 + Y + Y = -23
2Y = -20
Y = -10
Therefore X = -13
X + Y = -10 + -13 = -23
-X + Y = 10 + -13 = -3
2007-02-12 11:43:05 · answer #2 · answered by Anonymous · 1⤊ 0⤋
you can use linear combinations to solve this problem.
x + y=-23
randomly, i will use the opposite of x
-x+y=-3
x + y=-23
-x+y=-3
---------------
2y=-26
y=-13
x-13=-23
x=-10
so you can have:
-10 + (-13) = -23
10 + (-13) = -3
2007-02-12 11:45:27 · answer #3 · answered by ♥♥♥ 2 · 0⤊ 0⤋
-10 + -13
10 + (-13)
2007-02-12 11:45:10 · answer #4 · answered by iheartbassets3 4 · 0⤊ 0⤋