anyone good at algebra?
2006-12-01 09:20:38 · 5 answers · asked by Jeff J 1 in Science & Mathematics ➔ Mathematics
3y-21+xy-7x
Just simplify
3(y-7)+x(y-7)
(3+x) (y-7)
3+x=0 and y-7=0
-3 -3 +7 +7
x= -3 y= 7
2006-12-01 09:46:15 · answer #1 · answered by Rebel6 2 · 1⤊ 0⤋
3y-21+xy-7x=0
3y+xy-7x=21
let's factorise :
(y-7)x+3y=21
this is a straight equation:form ax+by+c
Set x=0 y=21/3 y=7
y=0 -7x=21 x=-21/7 x=-3
3y-21+xy-7x is a straight equation having a point A(-3,7).
2006-12-01 09:40:27 · answer #2 · answered by Johnny 2 · 0⤊ 0⤋
3y-21+xy-7x = 3(y-7)+x(y-7)= (3+x)(y-7)
2006-12-01 09:22:42 · answer #3 · answered by maegical 4 · 0⤊ 0⤋
I'm not sure what the questoin is, but I suspect it's factoring.
You have to use a method called grouping. Factor the first two terms and the last two terms.
3(y-7) + x(y-7)
Then, group the "like terms" of (y-7) to get
(3+x)(y-7)
2006-12-01 09:23:18 · answer #4 · answered by Puggy 7 · 0⤊ 0⤋
what are you trying to do? that's just an equation, f(x,y). You gotta be more specific.
2006-12-01 09:23:45 · answer #5 · answered by Anonymous · 0⤊ 0⤋