72x-32y=24
-72x+27y=9
-5y=-15
y=3
8x-3y=-1
8x-3(3)=-1
8x - 9=-1
8x =8
9x-4y=-3
8x-3y=-1
5 answers
I just need to know if it is correct
9 x - 4 y = - 3 Multiply both sides by 8
72 x - 32 y = - 24
8 x - 3 y = - 1 Multiply both sides by 9
72 x - 27 y = - 9
72 x - 32 y = - 24
-
72 x - 27 y = - 9
___________________
- 32 y - ( - 27 y ) = - 24 - ( - 9 )
- 32 y + 27 y = - 24 + 9
- 5 y = - 15 Divide both sides by - 5
y = 3
9 x - 4 y = - 3
9 x - 4 * 3 = - 3
9 x - 12 = - 3
9 x = - 3 + 12
9 x = 9 Divide both sides by 9
x = 1
72 x - 32 y = - 24
8 x - 3 y = - 1 Multiply both sides by 9
72 x - 27 y = - 9
72 x - 32 y = - 24
-
72 x - 27 y = - 9
___________________
- 32 y - ( - 27 y ) = - 24 - ( - 9 )
- 32 y + 27 y = - 24 + 9
- 5 y = - 15 Divide both sides by - 5
y = 3
9 x - 4 y = - 3
9 x - 4 * 3 = - 3
9 x - 12 = - 3
9 x = - 3 + 12
9 x = 9 Divide both sides by 9
x = 1
are you doing elimination
so, you got x=1
Use that in the other equations and see whether you get the same value of y for each.
If so, then that x and y are the solution.
Use that in the other equations and see whether you get the same value of y for each.
If so, then that x and y are the solution.