Question

4. Identify the point (x1, y1) from the equation: y – 9 = 3(x + 2)
(Points : 1)
(–2, 9)
(9, –2)
(2, –9)
(–8, 2)

Answer 1

y - y1 = m(x - x1)
y - 9 = 3(x + 2)

so x1 = -2 and y1 = 9....let me check it to make sure
y - y1 = m(x - x1)
slope = 3
(-2,9)...x1 = -2 and y1 = 9
sub
y - 9 = 3(x - (-2)
y -9 = 3(x + 2) (correct)

answer is (-2,9)