Question

Help! 2 equations.

Answer 1

1.) 3(x-7)-x=2x-21
7 ; -2 ; infinitely many solutions ; no solution
2.) 4+2y=9+2y
4 ; -4 ; infinitely many solutions ; no solution

Answer 2

for #1.. simplifying the equation you'll have
3(x-7)-x=2x-21
3x - 21 - x = 2x - 21
2x - 21 = 2x - 21
notice that both sides of the equation are equal.
remember when they are equal, whatever value of x you substitute in the equation will be true.. therefore it has infinite solutions
#2. 4+2y=9+2y
simplifying you'll have
4+2y=9+2y
2y - 2y = 9-4
0 is not equal to 5
since the equation did not acquire a true mathematical expression at the end then there are no solution to this

Answer 3

Thank you so much!