IDNStudy.com, ang perpektong platform para sa eksaktong at maaasahang mga sagot. Makakuha ng hakbang-hakbang na mga gabay para sa lahat ng iyong teknikal na tanong mula sa mga miyembro ng aming komunidad na may kaalaman.

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


Sagot :

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