Question

Explain how you can show that -3 is a solution of x + 7 = 4.

Answer 1

Isolate the variable.

x+7=4
-7 -7
x = -3

Answer 2

That's it really. Just do everything to both sides.

Answer 3

one way is replace x with -3 in
x+7=4

replace the x with -3:
-3 + 7 = 4

now do the arithmetic: -3+7 is 4, so you get
4=4
this is true, so x=-3 is a solution.

Answer 4

Thanks! :)

Answer 5

NP