Hey there!
GUIDE:
2 negatives = positive
2 positives = positive
1 negative & 1 positive = negative
1 positive & 1 negative = negative
ANSWERING THE GIVEN QUESTION
y = -4x
y = -4(7)
y = -28
Because, remember we said a NEGATIVE (-4) & a POSITIVE (7) gives you a negative [-28]
Therefore, the answer should be: -28
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)