Question

the sum of three times of a number and 12 is zero


solve the equation​

Answer 1

Answer:

Let the two numbers be x and y

As per question

x+y=12….. (1)

3x+5y=44…..(2)

Multiply (1) by 3 and (2) by 1

3x+3y=36

3x+5y=44

On subtraction

-2y=-8

y=4

Putting the value of y in (1)

x+4=12

x=12–4=8

The two numbers are 4 and 8

Step-by-step explanation:

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Answer 2

Answer:

$x=-4$

Step-by-step explanation:

Let the unknown number be $x$.

The mathematical expression is,

$3x+12=0$

Now solve for $x$.

$3x=-12\\x=\frac{-12}{3} \\x=-4$

The solution is $-4$.