Answer:
3y+4
Step-by-step explanation:
9y-6y=3y
Answer: y=4x+7 is the equation
(7y + 3x)(7y - 3x)
a² - b² = (a + b)(a - b)
49y² - 9x² = (7y)² - (3x)² {a = 7y ; b - 3x}
= (7y + 3x)(7y - 3x)