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2 years ago

Solve each system of equations by substitution Y=4x+13 y=6x+19

Mathematics

1 answer:

rosijanka [135]2 years ago

6 0

Answer:

I believe the answer to this question is: (-3,1) X=-3, Y=1.

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A jar contains 37 marbles of which 13 marbles are blue 10 red and rest are green. what is the ratio of green marbles to red marb

jeka94

37=blue+red+green
37-red-blue=green
37-13=10=green
14=green

green:red=
14:10=
7:5

5 0

2 years ago

Read 2 more answers

Graciela was trying to solve the quadratic equation x2+2.5x−1.5=0 "I think I need to use the Quadratic Formula because of the de

drek231 [11]

Answer:

The answer to your question is x² + 5/2x - 3/2 = 0

Step-by-step explanation:

Data

Quadratic equation x² + 2.5x - 1.5 = 0

Process

1.- Convert the decimals into fractions

2.5 = 25/10 = 5/2

1.5 = 15/10 = 3/2

2.- Substitution

x² + 5/2x - 3/2 = 0

3.- Conclusion

I rewrite the equation, now it is expressed in fractions. It could be solve by factoring.

7 0

3 years ago

How many different twotwo-letter passwords can be formed from the letters

Anna [14]

Answer:

$70$

Step-by-step explanation:

GIVEN: two two-letter passwords can be formed from the letters A, B, C, D, E, F, G and H.

TO FIND: How many different two two-letter passwords can be formed if no repetition of letters is allowed.

SOLUTION:

Total number of different letters $=8$

for two two-letter passwords $4$ different are required.

Number of ways of selecting $4$ different letters from $8$ letters $=^8C_4$

$=\frac{8!}{4!4!}$

$=70$

Hence there are $70$ different two-letter passwords can be formed using $8$ letters.

5 0

3 years ago

The sum of two numbers is 19, and their difference is 55. What are the two numbers?

Vilka [71]

Answer:

37 and -18

Step-by-step explanation:

Let one number be x and other y

1 x + 1 y = 19 .............1

1 x -1 y = 55 .............2

Eliminate y

multiply (1)by 1

Multiply (2) by 1

1 x 1 y = 19

1 x + -1 y = 55

Add the two equations

2 x = 74

/ 2

x = 37

plug value of x in (1)

1 x + 1 y = 19

37 + 1 y = 19

1 y = 19 -37

1 y = -18

y = -18

37 and -18

5 0

2 years ago

2x^3+5x^2-10 if x=-2

avanturin [10]

$▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪$

Let's evaluate :

${2x}^{3} + 5x {}^{2} - 10$

$2( - 2) {}^{ 3} + 5( - 2) {}^{2} - 10$

$(2 \times - 8) + (5 \times 4) - 10$

$- 16 + 20 - 10$

$- 26 + 20$

$- 6$

6 0

2 years ago

Read 2 more answers