7th grade math

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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.

  • 7th grade math -

    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.

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