3x - y =73x - (x-1) =7expand bracket, and note sign.3x -x +1=7 3x-x=2x2x-1=7add 1 to both sides 2x-1+1=7+1-1+1=02x=8now th evariablke x is mulitplied by 2, so we divide both sides by two to get one variable x.2x/2= 8/2x=4Hope this helps , good luck-1.......
put int o second requation or substitute for y.
3x - y =7
3x - (x-1) =7 expand bracket, and note sign.
3x -x +1=7 3x-x=2x
2x-1=7
add 1 to both sides 2x-1+1=7+1
-1+1=0
2x=8
now th evariablke x is mulitplied by 2, so we divide both sides by two to get one variable x.
2x/2 = 8/2
x=4
Hope this helps , good luck
1.
subract 4, multiply by 2, divide by 3. Answer= -10/3
2.
subtract 4, multiply by -7 Answer= 35
3.
In second equation set y equal to x. y=3x-7. Plug this into first eqution. x=(3x-7) +1, solve x=3x -6, add 6 to each side, and subtract an x from each side. 6=2x divide by 2 and x=3. plug this into first equation 3=y+1 y=2 Answer= x=3 y=2
4.
Samde stup as # 3, answer is -1
3a/2=-1-4=-5. Or. 3a=-5*2=-10. Or. a=-10/3
Dont understand #2
Put 1st equat in 2nd. Or 3(y+1)-y=7. Or. Y=2. X=3
Put 1st equat in 2nd. Or. X=2(6-3x)-19. X=-1. Y=9
