7th grade math
posted by saranghae12 .
How would you solve the problem below using subsitution method?
7x  2y = 5
x = y
If you could explain and show this step by step, it would help a lot.
How would you solve the problem below using combination method?
3x  2y = 12
3x + 8y = 6
If you could explain and show this step by step, it would help a lot.
Thank you.

Substitute x for y in first equation and solve for x. If they were not exactly equal, insert that value into the second equation and solve for y. Check by inserting both values into the first equation.
Combination method
Add the two equations.
6y = 6
y = 1
Insert that value into one equation and solve for x. Check by inserting both values into the other equation.