Question

35 points!! Only comment if you really know the answer please.

What is the y-coordinate of the solution for the system of equations?
{y=3x−1
{x−y=−9

Enter your answer in the box.

Answer 1

14

Explanation:

Answer 2

y = 3x - 1 ---- (1)
x - y = -9 ---- (2)

From Equation 2:
x - y = - 9
x + 9 = y
y = x + 9 --- (2a)

(1) - (2a):
0 = 3x - x - 1 - 9
0 = 2x - 10
2x - 10 = 0
2x = 10
x = 5 ---- sub into (1)

y = 3(5) - 1
y = 15 - 1
y = 14