Five times the first number added to the second number is -21

Two times the first number added to the second number is -9

Question

01-11-2019
Mathematics

contestada

Five times the first number added to the second number is -21

Two times the first number added to the second number is -9

Respuesta :

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divyeshnarshi divyeshnarshi · Answer 1 · 2019-11-01T11:43:01+01:00

divyeshnarshi divyeshnarshi

01-11-2019

Answer

let the first number be x

second number be y

5*(x)+y=-21---------->equation 1

2*(x)+y=-9------------->equation2

**eq1 * 2:**

2(5x+y)=2*-21

10x+2y=-42

**eq2 * 5:**

10x+5y=-45

10x+2y=-42

-(10x+5y=-45)

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

0 - 3y=3

y=3/-3

y=-1

sub y=-1 in eq1;

5x+y=-21

5x+ -1=-21

5x-1=-21

5x=-21+1

5x=20

x=20/5

x=4

y=-1

Answer Link

Five times the first number added to the second number is -21Two times the first number added to the second number is -9​

Respuesta :

eq1 * 2:

eq2 * 5:

y=-1

sub y=-1 in eq1;

5x+y=-21

5x+ -1=-21

5x-1=-21

5x=-21+1

5x=20

x=20/5

x=4

y=-1

Otras preguntas

Five times the first number added to the second number is -21

Two times the first number added to the second number is -9

**eq1 * 2:**

**eq2 * 5:**