Solve the system by addition.
x + y = 4
x – y = 10
2007-07-22 16:41:54 · 9 answers · asked by Sara B 3 in Science & Mathematics ➔ Mathematics
Adding gives:-
2x = 14
x = 7
x + y = 4
7 + y = 4
y = - 3
x = 7 , y = - 3
2007-07-23 23:22:30 · answer #1 · answered by Como 7 · 0⤊ 0⤋
x + y = 4
x - y = 10
answer
x + y = 4
x = 10 + y
10 + y + y = 4
10 + 2y = 4
2y = -6
y = -3
when y =-3,
x - 3 = 4
x = 7
x = 7, y = -3
2007-07-23 00:04:12 · answer #2 · answered by Lin 1 · 0⤊ 0⤋
x + y = 4
x - y = 10
answer
x + y = 4
x = 10 + y
10 + y + y = 4
10 + 2y = 4
2y = -6
y = -3
when y =-3,
x - 3 = 4
x = 7
x = 7, y = -3
2007-07-22 23:46:11 · answer #3 · answered by Beach bum 4 · 0⤊ 0⤋
x+y=4
+ x-y=10 the y's cross out because one is + and one -
----------
2x=14
x=7 so, substitue 7 for x
[7]+y=4
y=4-7
y=-3
2007-07-22 23:45:53 · answer #4 · answered by amandoecaboodle 1 · 0⤊ 0⤋
x=10+y
10+y+y=4
10+2y=4
2y-4-10
y= -3
x+y=4
x+( -3)=4
x-3=4
x=4+3
x=7
so x=7 and y = -3
2007-07-22 23:48:43 · answer #5 · answered by kevin 1 · 0⤊ 0⤋
x=7 y=-3
7+(-3)=4
7-(-3)=10
2007-07-22 23:46:35 · answer #6 · answered by Bridgeofstraws 2 · 0⤊ 0⤋
7 right from origin and down 3 units is
the intersection of the two lines.
2007-07-22 23:49:33 · answer #7 · answered by winter_new_hampshire 4 · 0⤊ 0⤋
You have to add the equations together....
X + Y=4
X- Y=10
Adding these two together you get 2X = 14....X= 7, Y= -3
-H
2007-07-22 23:51:21 · answer #8 · answered by Hector D 4 · 0⤊ 0⤋
2x=14
x=7 why?
2007-07-22 23:55:09 · answer #9 · answered by william b 2 · 0⤊ 0⤋