Solve the system of equations using substitution y=2x-10 y=4x-8

It should be,
4x-8=2x-10    because you substitute that for y.
Now you do,
4x-2x    because you do the opposite of the positive 2x as you bring it to the other side.
That is,
2x-8=10   now you bring the 8 to the other side.
2x=10+8   I added it because I do the opposite and it is a negative 8 so I add.
2x+18    now divide
x=9    that's the answer.

Pp= 50 pounds of apples

Idon’t know actually is more difficult