99
(-4, -1)
It is the infinite set of points of the form [x, (4x+9)/7] for all value of x in its domain.
14x+7y=-9
The answer to the problem of 13 equals -4x plus 9 is x equals -1.
7y+5=-9... 7y must equal -14 therefore y must be -2
5x = 4x + 9 x = 9
7y-8 = 6y+1 7y-6y = 1+8 y = 9
4x+5 = -9 4x = -9-5 4x = -14 x = -3.5
-4x + 3y = 9
4x
-5x + x + 9 = -4x + 12 -4x + 9 = -4x + 12 9 = 12 This equation has no solution.
Substitute the values of x and y in 10x + 7y, thus: 10x + 7y = 10*9 + 7*6 = 90 + 42 = 132