Just learned equations and want to know if i am doing right 4 problems.
4y= 2x-2
2y=2x6
ans (-7,-4)
x+2y=7
3x-2y= -11
ans (-1,4)
4x-3y= -20
5x-7y= -64
ans (4,12)
2x-5y=-1
3x+2y=8
ans (2,1)
1. S=(-7,-4)
4(-7)= 28≠-10 =2(-4)-2
so S is incorrect.
2. S=(-1,4)
(-1)+2(4)=7 = 7
3(-1)-2(4)=-11 = -11
Yes, S is correct
3. S=(4,12)
4(4)-3(12)=-20 =-20
5(4)-7(12)=-64 =-64
Yes, S is correct.
4. S=(2,1)
2(2)-5(1)=-3 ≠-1
So S is not correct.