Add 21 to both sides, then that means you get
K>22
there is no need to change the signs, as you are not multiplying by a negative or anything
A~~~~~~~~~~~~~~~~~~~~~~~~
Answer: 3
Step-by-step explanation:
Top left is (-1,4)
top right is (4,2)
bottom middle is (1,-1)
Start by isolating the x term which is 20x by dividing both sides by 20.
That leaves you with <em>x = 10/20</em> which can be reduced to <em>x = 1/2</em>.