Answered

Sumali sa IDNStudy.com at makakuha ng mabilis at maaasahang mga sagot. Magtanong ng anumang bagay at makatanggap ng detalyadong sagot mula sa aming komunidad ng mga eksperto.

verify the given values of xare solutions to the equation.  
7x+2=9 : x=1,   ,x=-1 

Sagot :

Alvedeguzidn
7x+2 = 9 where x = 1 or -1

We need to substitute the vale of x first

let's try the positive one first.

7(1)+2 = 9

7 + 2 = 9

9 = 9 correct

let's try the negative one.

7(-1)+2 = 9

-7 + 2 = 9

-5 = 9 incorrect

Meaning that the positive one is the correct answer.

We can simply look for x without the given values

7x+2 = 9

move 2 to the right and change sign

7x = 9 - 2

Subtract

7x = 7

divide by 7 both sides to remove fractions

7x/7 = 7/7

x = 1

There you go :)

I hope it helps