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natka813 [3]
3 years ago
14

Solve the system of equations.

Mathematics
1 answer:
alukav5142 [94]3 years ago
3 0
Note:  in the 2nd eqn we are given a formula for x:  x = 2y-15.  Sub this result into the first eqn; doing so will eliminate x:

-5(2y-15)+4y =3

-10y + 75 + 4y = 3, so -6y = -72.  Then y = 12.  Solution is (9,12).

Check this by subst.:

Is -5(9)+4(12) = 3?
Is -45  + 48 = 3?  YES.

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____________________________

You can also solver this problem by multiplying the number of tables, 7, by the number of player per table, 4.

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