Posted by **Anonymous** on Sunday, November 29, 2009 at 6:01pm.

x+3y=-10

7x-5y=34

solve using substitution method

- algebra -
**MathMate**, Sunday, November 29, 2009 at 6:28pm
x+3y=-10 ......(1)

7x-5y=34 ......(2)

From (1), write it as:

x=-10-3y ......(3)

Substitute x in (3) into (2)

7(-10-3y)-5y=34 .....(4)

Expand the left hand side

-70-21y-5y=34

Isolate y

-21y-5y = 34 + 70

-26y = 104

Calculate y:

y=104/-26 = -4 .....(5)

Now substitute (5) into (3) to find x.

After that, substitute the values of x and y into equations (1) and (2) to verify if the solutions are correct.

- algebra -
**kelly rutherford**, Sunday, November 29, 2009 at 6:31pm
x=-3y-10

7(-3y-10)-5y=34

-21y-70-5y=34

-27y-70=34

-21y=104

y=-104/21

this is your y value now just plug this value back into the x to find your x value

hope this helped.

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