Answer:
Multiply x + y = 3 by 3 and add it to -3x - 2y = -7
Step-by-step explanation:
When using elimination to solve a system of equations, you multiply one equation by some number. The reason for doing this is that when you add it to the second equation, you want one variable to cancel out. When one variable cancels out (in this case x), you can solve for the other variable (in this case y). I will show this:
3(x + y = 3) = 3x + 3y = 9
3x + 3y = 9
+ -3x + -2y = -7
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y = 2
Now, knowing that y = 2, you can substitute y=2 into either equation to solve for x.
-3x - 2(2) = -7
-3x -4 = -7
-3x = -3
x = 1 | to double check (1, 2) as your answer plug these values into both equations
Finding this solution would not have been possible if not for cancelling out the x's above. The other three are wrong because none of the other options cancels out one of the variables.
Answer:
3.5
Step-by-step explanation:
Because if .5 turns into one whole if you add .5 then its a half and so when you put the .5 into a fraction so thats the answer.
Answer:
C
Step-by-step explan:
I rlly hope this is right im sorry if its not.
Answer: 121.836
Step-by-step explanation: So the first thing you need to do is:
31.24
x3.90 you need to put the zero there because the decimal points would need to match up.
_____
Once you do that just put the decimal down. Like this:
31.24
x3.90
____ Once you do that just ignore the decimal and multiply.
.
Once you have finished, the answer should be 121.836.
Hope I Helped!
:)
