MATHEMATICS HIGH SCHOOL

solve using the substitution and elimination method

3a-12b=9

4a-5b=3

can someone please help?

Answers

Answer 1
Answer: 3a-12b=9 => a = 4b + 3; but, 4a-5b=3 => 4(4b + 3) -5b = 3 => 11b = -9 => b = -9/11 => a = -36/11 + 3 = -3/11;
Answer 2
Answer:

Answer:6969

Step-by-step explanation:

Its the best answer

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What value for c will make the expression a perfect square trinomial? x2 – 7x + c

Answers

Answer: 12.25

Step-by-step explanation:

 A perfect square trinomial is written as ax^2+2abx+b^2 , where

first termax = square of first term of binomial

second term=2abx=twice the product of both terms of binomial.

and third term 'c'=square of last term of binomial

In the given polynomial ,x^2+7x+c, a=1

and 2ab = 7

When we put value of a =1, we get

2(1)b=7\n\Rightarrow\ b=(7)/(2)

Hence, in place of the question mark makes the given polynomial a perfect square trinomial =b^2=((7)/(2)^2=12.25
I assume the first part of that equation is x^2. -7/2= 3.5 ; 3.5^2=12.25 sooo it should end up as x^2-7x + 12.25. but I might be wrong.

Which statement about vertical angles is false?A. They are formed by two intersecting lines
B. They share a common vertex
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Answers

The answer is C..

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Mauro has 140 ft of rope. He will cut it into two pieces so that the length of the longer piece is 3 times the length of the shorter piece. What will the length of the longer piece be? _________ ft

Answers

Answer:

The length of the longer piece is 35 feet.

Step-by-step explanation:

Let the length of the longer piece is x

Hence, length of the shorter piece is 3x

Now, the length of the rope is 140 ft. Thus, we have the equation

x+3x=140

Add the like terms. x+3x=4x

4x=140

Divide both sides by 4

x=35

Therefore, the length of the longer piece is 35 feet.
140= x +3x
140 =4x
140/4= 4x/4
35= x
3x= 105
The length of the longer piece is 105 feet

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Answers

Answer:

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Step-by-step explanation:

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Answers

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