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The two original functions are 4x+9y=7 and 4x-9y=9
To use the combination method, add all the values of the two equations together to cancel out one of the variables
4x+4x+9y-9y=7+9
8x=16
8x/8=16/8
x=2
4(2)+9y=7
8+9y=7
8-8+9y=7-8
9y=-1
y=-
To use the combination method, add all the values of the two equations together to cancel out one of the variables
4x+4x+9y-9y=7+9
8x=16
8x/8=16/8
x=2
4(2)+9y=7
8+9y=7
8-8+9y=7-8
9y=-1
y=-
Answer:
None of the expressions is simplified to 41.
Step-by-step explanation:
You have to follow the P.E.M.D.A.S., this is:
P:Parentheses first.
E:Exponent next.
M:Multiplication.
D:Division.
(Multiplication and Division is whichever come first, from left to right)
A: Addition.
S: Subtraction.
(Addition and Subtraction is whichever come first, from left to right).
<u><em>We are going to analyze every option:</em></u>
1. 10+ 2.4 - 1
First we have to solve the multiplication:
Now we have to solve the addition and subtraction from left to right:
This is not a correct answer.
2. 10+2.(4-1)
We have to solve the parentheses first:
Now the multiplication and then the addition.
This is not a correct answer.
3. (10+23).4-1
We have to solve the parentheses first:
Now the multiplication and then the subtraction:
This is not a correct option.
4.
We have to solve the parentheses first, in the parenthesis first we have to solve: and then do the multiplication.
Now we have to solve the addition and subtraction from left to right:
This expression is not a correct option.
Then none of the expressions is simplified to 41.