How do you solve this problem? My teacher didn't explain it to us very well and it is due tomorrow. HELP PLEASE!
2006-10-09 09:48:12 · 5 answers · asked by ~*Monkey*~ 2 in Education & Reference ➔ Homework Help
well u have two variables..the only thing u can do is solve for one variable..
so, y = -2x + 7
and then if u plug in a # for x, you will get y:
example, if x =2, then y = -2(2) + 7 = 3
(2,3) is one of the answers..good luck!
2006-10-09 09:50:45 · answer #1 · answered by sasmallworld 6 · 0⤊ 0⤋
2x+y=7
x=3 y=1 or y=5 x=1
y= -2x+7
x=1/2y+7/2
2006-10-09 16:58:14 · answer #2 · answered by kiss_me22 2 · 0⤊ 0⤋
Are you graphing? There are in infinite number of solutions to this problem... You need two equations to solve for two variables unless you are graphing. For graphing put in y = mx+b form...y = -2x +7 ...y-intercept is 7 and slope is 2/1
2006-10-09 16:57:36 · answer #3 · answered by dla68 4 · 0⤊ 0⤋
It will depend on what you are solving for, x or y.
To solve for Y
2x + y = 7
Subtract 2x from each side
y = 7-2x or y = -2x + 7
To solve for x
2x + y = 7
Subtract y from both sides
2x = 7-y
Then divide both sides by 2
x = 7-y
------
2
2006-10-09 16:54:39 · answer #4 · answered by GAgirl 4 · 0⤊ 0⤋
x = 2
y = 3
or
x = 3
y = 1
2006-10-09 16:50:02 · answer #5 · answered by Anonymous · 0⤊ 0⤋