WAEC - Mathematics (2024 - No. 34)
The gradient of the line joining the points P(2, -8) and Q(1, y) is -4. Find the value of y
2
4
-4
-3
설명
P(2, -8) and Q(1, y)
Gradient of slope(m) = \(\frac{y_2 - y_1}{x_2 - x_1}\)
- 4 = \(\frac{y - (-8))}{1 - 2}\)
-4 = \(\frac{y + 8}{- 1}\)
cross multiplying
4 = y + 8
y = 4 - 8 = -4