Question

Consider the equation 7x+2(x+5)=9x+10.

(a) Show that x=-5 and x = 2 are both solutions to this equation.

Answer 1

7*-5+2(-5+5)=-35

9*-5+10=-35

7*2+2(2+5)=28

9*2+10=28

Explanation:

when plugging the x values in, you get the same answer for both equation, make the equation equal.