I am x years old and my brother is 7years . If you take 80% of the sum of our ages the result will be 12. Write an equation and solve it to find my age

8years

Step-by-step explanation:

I am x years old and

my brother is 7years .

The sum of our ages is (x+7)

If you take 80% of the sum of our ages the result will be 12.

80%(x+7)=12

(80/100)(x+7)= 12

(4/5)(x+7)=12

These is the equation (4/5)(x+7)=12

Divide both sides by 4/5

(x+7)= 12 /(4/5) = 12×(5/4) = 3 ×5= 15

x+7 = 15

x= 15-7 = 8

My age is x= 8 years

And my brother is x+7 = 8+7 = 15years

you are 8 years old.

Step-by-step explanation:

You are x years old and your brother is 7years old. The sum of your ages is

(x + 7) years

If you take 80% of the sum of our ages the result will be 12. 80% of the sum of your ages is

80/100 × (x + 7) = 0.8(x + 7)

Therefore,the equation would be

0.8(x + 7) = 12

0.8x + 5.6 = 12

0.8x = 12 - 5.6

0.8x = 6.4

x = 6.4/0.8

x = 8 years

step-by-step explanation:

let

we know that

the y-intercept is the y-coordinate of the point when the value of x is equal to zero

so

the y-coordinate of the point a is the y-intercept

the answer part a) is

the value of y-intercept is

part b) find the slope m

we know that

the value of the slope is equal to

substitute the values

therefore

the answer part b) is

the value of the slope is equal to

the general answer is

the slope is

the value of y-intercept is

step-by-step explanation:

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