Answer:
(x, y) = (-6, 0)
Step-by-step explanation:
The y-coefficients have opposite signs, so we can eliminate y-terms by multiplying both equations by a positive number and adding the results.
9 times the first equation plus 4 times the second gives ...
9(5x +4y) +4(3x -9y) = 9(-30) +4(-18)
45x +36y +12x -36y = -270 -72 . . . . eliminate parentheses
57x = -342 . . . . . collect terms
x = -6 . . . . . . . divide by the coefficient of x
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Substituting into the first equation gives ...
5(-6) +4y = -30
4y = 0 . . . . . . . . . add 30
y = 0
The solution is (x, y) = (-6, 0).
1 dozen = 12........so 12 dozen eggs is (12 * 12) = 144 eggs
she sold 5/6 of the eggs.....so she sold : 5/6 * 144 = 720/6 = 120 eggs
she gave her friends (144 - 120) = 24 eggs
(a) 12x = 120.....with x being the number of dozens of eggs
x = 120/12
x = 10 <== she gave away 10 dozen eggs
(b) she sold a dozen for 4.50....
4.50x = E .......x = the number of dozens of eggs sold and E = total earned. She sold 10 dozen...so sub in 10 for x
4.50(10) = E
45 = E <=== she earned $ 45 from the eggs she sold
If you would like to know which of the following steps should be performed to eliminate variable d first, you can find this using the following steps:
equation a: 2c = d - 8 /*(-3)
equation b: c = 3d + 8
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-6c = -3d + 24
c = 3d + 8
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-6c + c = -3d + 24 + 3d + 8
-5c = 32
5c = -32
c = -32/5
<span>The correct result would </span>be: <span>multiply equation a by −3.</span>
480 is the answer i hope it is correct
I don't really see the shaded area...
