Lets say that J is for Jennys messages, B is for Boris’ and E is for Erics (or Ericas?).
79 = J + B + E
J = E - 6
B = 3E
Since both Jenny’s and Boris’ number of text messages has some kind of relation to Eric’s number of messages, we can say that:
79 = E - 6 (Jenny) + 3E (Boris) + E (Eric), so:
79 = E - 6 + 3E + E /combine like terms
79 = 5E - 6 /add 6 to both sides
79 + 6 = 5E /switch sides + combine like terms
5E = 85 /divide both sides by 5
E = 85/5
E = 17
So, Eric sent 17 messages. Lets get back to those equations we made for Jenny and Boris:
J = E - 6 = 17 - 6 = 11
B = 3E = 3 * 17 = 51
And we can check if it adds up: 51 + 11 + 17 = 79, which is what we were supposed to get.
<em>Subtract</em> 2/3x on both sides.
Combine 5/3x and -2/3x to get x.
Subtract 4 from both sides. <em>Any value</em> subtracted from zero results in its negative value.
Answer:
Hope this helps!
Step-by-step explanation:
Force= mass*acceleration.
-25= 10x
Divide both sides by 10
-2.5=x
Final answer: The acceleration is -2.5 in the direction of the force.
