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km8115
11.07.2019 •
Mathematics
Solve y = 3x – 2 x – y = 4 by using show all work! !
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Ответ:
(-1,-5)
Step-by-step explanation:
So we have the system:
y=3x-2
x-y=4.
We are asked to use substitution. Luckily, it is already setup for this because one of the equations has one of the variables solved for, namely the y=3x-2 equation. We are going to insert y=3x-2 into x-y=4 and solve for x.
x-y=4 (with y=(3x-2) ):
x-(3x-2)=4
Distribute:
x-3x+2=4
Combine like terms:
-2x+2=4
Subtract 2 on both sides:
-2x =2
Divide both sides by -2:
x =-1
Now if y=3x-2 and x=-1, then y=3(-1)-2=-3-2=-5.
So the solution is (-1,-5).
Ответ:
500,00.00.
Step-by-step explanation:
The hundred thousand is the sixth digit to the left from the decimal point. For this number it is 4.
Since the ten thousand digit is 8 we round up the 4:
The answer is 500,000.00.