Homework Help: 7th grade math

Posted by saranghae12 on Monday, April 9, 2012 at 10:57pm.

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 - PsyDAG, Tuesday, April 10, 2012 at 2:22pm
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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