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Scilla [17]
3 years ago
13

Solve the system by using the combination method 4x+9y=7 4x-9y=9

Mathematics
1 answer:
harkovskaia [24]3 years ago
7 0
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=-\frac{1}{9}
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What is a solution to (x + 6)(x + 2) = 60?<br> 0 x = -6<br> 0 x = -4<br> 0 х = 4<br> 0 х = 12
mr Goodwill [35]
X = 4.

4 + 6 = 10

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7 0
3 years ago
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a crew of highway workers paved 2/15 mile in 20 minutes.if they continued working at the same rate,what portion of a mile wil th
icang [17]

Answer:

2/5 of a mile

Step-by-step explanation:

The easiest approach is to realise that one hour is 3 times longer than  

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2/5  of a mile, in 20 minutes, how much in 60 minutes?(#)

They will pave 3 times more.

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8 0
3 years ago
I need to know how to multiply 2/9×5/7
lord [1]

Answer: 10/63

Step-by-step explanation: To multiply fractions, you just time's the top numbers and then the bottom numbers by themselves.

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and there is your answer.

:)

4 0
2 years ago
Differentiation. questions 1 and 2
drek231 [11]
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4 0
3 years ago
Help me what’s the answer .
Mandarinka [93]

Answer:

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Step-by-step explanation:

i helped my friend on this before but it was a word problem

8 0
3 years ago
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