y = -1
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9y-3y=6y; 6y+2y=8y; so your answer is 8y
13x - 9y - 10
9y - 18 = 3y subtract 3y from both sides 6y - 18 = 0 add 18 to both sides 6y = 18 divide by 6 on both sides y = 3
3x-3y=-9 and 9x-9y=-27 both simplifies to x-y=-3.
2x - 3y = 5 => 3y = 2x - 5 has a gradient of 2/3 9y + bx = 4 => 9y = -bx + 4 has a gradient of -b/9 The two gradiends must be the same if the two lines are parallel: 2/3 = -b/9 so that b = -6