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Elenna [48]
3 years ago
12

7x-5y=-15 and -14x+7y=0 Solve by elimination

Mathematics
1 answer:
geniusboy [140]3 years ago
4 0

Answer: (5,10)

Step-by-step explanation:

multiply first equation with 2 and add it to second to eliminate X

7x-5y=-15  //*2

14x-10y=-30

-14x+7y=0

----------------

-3y=-30

y=-30/-3

y=10

7x=50-15

7x=35

x=35/7

x=5

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7 0
3 years ago
What is 19/50 in decimal form
Lilit [14]
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5 0
3 years ago
Q14
posledela

Answer:

42.6cm

Step-by-step explanation:

The sum total of all the sides of the shape is the perimeter of the shape. Hence;

Perimeter = x+3 + 4 + x+9 + 2x+5

Perimeter = 4x + 21

Given

Area of the figure = 75cm^2

Area = (x+3)(2x+5) + (2x+1)(6)

75 = 2x²+5x+6x+15+12x+6

75 =  2x²+23x+21

2x²+23x+21-75 = 0

2x²+23x-54 = 0

x = -23±√23²-4(2)(-75)/4

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Perimeter = 4x+21

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8 0
3 years ago
One number is 2 less than a second number. Twice the second number is 17 less than 5 times the first
gulaghasi [49]
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Substituting for x into the second equation, we find
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Thus, the two numbers are 7 and 9.
4 0
3 years ago
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