If they can be multiplied or divided by the same number and they both have the same answer it is equivelent.
You can use a simultaneous equation - x + 7y=24 minus x-9y= -24 you end up with 16y = 48
Divide 48 by 16 and you get 3 is equal to y. Now put three into an equation eg, x + 21 = 24 it is now obvious that x = 3 as well as y = 3
Answer: Ted
Step-by-step explanation: