Question 744631
9x + 4y = 9/4
y = 4x - 1

Substitute 4x -1 for 'y'
9x + 4(4x - 1) = 9/4
9x + 16x - 4 = 9/4
25x - 4 - 9/4 = 0

Convert -4 to quarters

25x - 16/4 - 9/4 = 0

25x - 25/4 = 0

Common denominator 4

100x - 25 = 0

100x = 25

x = 25/100

x = 1/4

Substitute x = 1/4 into y = 4x -1 => y = 4(1/4) - 1 => y = 0

  { 1/4, 0 )