Tell me on how they got that answer for number 11

First we set the chicken dish as the variable x and the beef dish as the variable y.

x + y = 250

5x + 7y = 1500

We then solve for x on one of the equations.

x = 250 - y

Then we plug this into the second equation.

5(250 - y) + 7y = 1500

1250 -5y + 7y = 1500

2y = 250

y = 125

Karina served 125 beef dishes.

We then plug this value into x + y = 250 to find x.

x + 125 = 250

x = 125

Karina served 125 chicken dishes.

the first one

step-by-step explanation:

just id the test.

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