Answer:
Step-by-step explanation:
hello :
1) the system is : y=5x+4
y = 2x+1
so :5x+4 =2x+1
5x-2x=1-4
3x= -3 so : x= -1 but y =2x+1 put x=-1 you have : y =-1
the solution : (x,y) =( -1, -1)
2) the system is : x + y = 4
4x -y = 1
means : y = - x+4 (line red)
y= 4x-1 (line blue)
graficly : intrsection is : (x,y) =(1 ,3 )
The correct answer is Choice E: 1 milligram.
The prefix milli means "1/1000". That means a milligram is 1/1000th the size of a gram. All of the other weights in the list are larger.
The answer is d because if you multiply-5x2 and then subtract 1 you get -11
Answer:

Step-by-step explanation:
A proportional relationship has equation:

where k is the constant of proportionality.
Since we are looking for a proportional relationship that has a constant of proportionality equal to -10, we have k=-10.
We substitute k=-10 into the equation to get:

Therefore the correct choice is

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<em><u>Answer:</u></em>
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<em><u>13 and 5</u></em>
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<em><u>Step-by-step explanation:</u></em>
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<em><u>x+y=18</u></em>
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<em><u>x-y=8</u></em>
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<em><u>_____</u></em>
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<em><u>2x=26</u></em>
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<em><u>x=13</u></em>
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<em><u>So the first number must be 13</u></em>
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<em><u>13+y=18</u></em>
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<em><u>y=5</u></em>
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<u><em>And the second number must be 5</em></u>