x+y=85
x-y=45
i need to know the value of each one.
i forgot how to do it.
2006-10-30 15:46:36 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
um, yea... nm.. i figured it out.
x=65
y=20
correct me if im wrong
2006-10-30 15:47:46 · update #1
You kicked some butt.
2006-10-30 15:54:01 · answer #1 · answered by Mech_Eng 3 · 0⤊ 0⤋
x + y = 85
x - y = 45
Add similar terms
2x + 0 y = 130
x = 65
go to the equation x + y = 85
substitute
65+ y = 85
y = 20
2006-10-30 23:54:03 · answer #2 · answered by teacher2006 3 · 0⤊ 0⤋
Yes you are right
x + y = 85
x - y = 45
------------------ - substract the bigger one
2y = 40
y = 40/2
y = 20
or
x + y = 85
x - y = 45
------------------ + add both
2x = 130
x = 130/2
x = 65
proof it.
65 + 20 = 85
65 - 20 = 45
prooved.
2006-10-31 00:42:23 · answer #3 · answered by safrodin 3 · 0⤊ 0⤋
x+y=85......(1)
x-y=45
adding both the equations
2x=85+45
2x=130
x=65
put value in equation (1)
65+y=85
y=20
2006-10-30 23:53:47 · answer #4 · answered by silent rain 2 · 0⤊ 0⤋
Correct.
2006-10-30 23:50:26 · answer #5 · answered by Helmut 7 · 0⤊ 0⤋
good job, you are right. Just combine the two equations. x+x-y+y= 130. x=65 y=20
2006-10-30 23:56:19 · answer #6 · answered by matt 2 · 0⤊ 0⤋
add the equations, and then you'll figure it out. after you have added the equations, plug in what you got for the variable into the other equation, and then you will have your answer1
2006-10-30 23:54:42 · answer #7 · answered by ▪♥▪ 3 · 0⤊ 0⤋
I just wanted to let you know that you're right. That's the answer I got too.
2006-10-30 23:48:54 · answer #8 · answered by PootieThangRawr 2 · 0⤊ 0⤋
Your correct.
2006-10-30 23:51:18 · answer #9 · answered by futureastronaut1 3 · 0⤊ 0⤋
you are right,very clever
2006-10-31 02:30:03 · answer #10 · answered by peterwan1982 2 · 0⤊ 0⤋