Posted by **Gilda** on Monday, April 19, 2010 at 6:43am.

Solve the pairs of simultaneous equations by the substitution method.

5x-9y=17

3x-8y=5

- Math -
**Reiny**, Monday, April 19, 2010 at 6:54am
(poor method for this particular question, but ...)

solve the second for x, (I look for the smallest coefficient)

3x = 5+8y

x = (5+8y)/3

sub into the first

5(5+8y)/3 - 9y = 17

multiply by 3 to eliminate fractions

5(5+8y) - 27y = 51

25 + 40y - 27y = 51

13y = 26

y = 2

then x = (5+16)/3 = 7

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