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miskamm [114]
2 years ago
13

Find the value of x ?

Mathematics
1 answer:
Digiron [165]2 years ago
3 0

Answer: 60 please give brainliest

Step-by-step explanation:

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HEEEEELP!!!!!!!!!!!!!11 I WILL MARK BRAINLIEST kx-3y=4 4x-5y=7 k is constant and x and y are variables, for what value of k will
Studentka2010 [4]

Answer:

<h2>               A.  ¹²/₅</h2>

Step-by-step explanation:

There is no solution for system of equations:  a_1x+b_1y=c_1\\a_2y+b_2y=c_2

if:     a_1=a_2\quad and\quad b_1=b_2\quad and\quad \bold{c_1\ne c_2}

so first, we we need to transform the equations to the form where the coefficients at y will be the same:

kx-3y=4\\ 4x-5y=7\\\\ (kx-3y)\cdot5=4\cdot5\\ (4x-5y)\cdot3=7\cdot3\\\\ 5kx-15y=20\\ 12x-15y=21

Now we have  b₁=b₂ and c₁≠c₂ so the system has no solution if a₁=a₂

5k = 12

÷5     ÷5

k = ¹²/₅

7 0
3 years ago
Math help me please n
BARSIC [14]

Answer:

Step-by-step explanation:

21x1/12=1.75 cm

1.75x10=17.55 mm

17.55 mm

4 0
3 years ago
Trevor is painting the front door of his house. The dimensions of the door are 812 feet by 212 feet by 3 inches. If he paints al
Sophie [7]

Answer:

Below!

Step-by-step explanation:

Step 1:

Convert!

812 x 12 = 9744

212 x 12 = 2544

Step 2:

Multiply the new dimensions!

9744 x 2544 x 3

Step 3:

The answer would be:

74366208 in.

BUT!

We're not done yet!

Step 4:

Duplicate it!

REAL ANSWER:

148732416  in. or 12394368 feet!

3 0
3 years ago
Read 2 more answers
Find the value of x that will make A||B
Jlenok [28]

Answer:

x=20

Step-by-step explanation:

For A to be parallel to B, the angles of 5x+20 and 3x+60 must be equal.

5x+20=3x+60

2x=40

x=20

3 0
3 years ago
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51 dollars is 75 percent of the original price. what is the original price?
makvit [3.9K]
89.25 is the original price first i did 75÷100=0.75×51=38.25+51=89.25 is the correct answer.
5 0
3 years ago
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