Respuesta :

First solve the second equation to equal x.

x + y = 550

Subtract y from both sides.

x = 550 - y

Put this into the first equation in place of x.

3.75 (550 - y) + 4y = 2160

Multiply everything in the parenthesis by 3.75

2062.5 - 3.75y + 4y = 2160

Combine like terms.

2062.5 + 0.25y = 2160

Subtract 2062.5 from both sides.

0.25y = 97.5

Divide 0.25 on both sides.

y = 390

Put this into the second equation in place of y.

x + 390 = 550

Subtract 390 from both sides.

x = 160

So x = 160 and y = 390

Hope this helps!

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