Answer:
Sentential form
Explanation:
A sentence is a sentential form when it has only symbols (P, Q, A...). It may have terminal symbols or start symbol.
B) is the the correct way to phrase this sentence.
The 2nd two should be a 3
7y+3=4y-18
move 4y to the other side
sign changes from +4y to -4y
7y-4y+3= 4y-4y-18
7y-4y+3= -18
3y+3= -18
move 3 to the other side
3y+3-3= -18-3
3y= -21
divide both sides by 3 to get y by itself
3y/3= -21/3
answer:
y= -7
