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3x-5y-4=0 and 
9x=2y+7

3x5y4=0 3 x-5 y-4=0 and 9x=2y+7 9 x=2 y+7

Full solution

Q. 3x5y4=0 3 x-5 y-4=0 and 9x=2y+7 9 x=2 y+7
  1. Substitute y: Step Title: Substitute y in the second equation\newlineCalculation: 9x=2(3x45)+79x = 2\left(\frac{3x - 4}{5}\right) + 7
  2. Solve for x: Step Title: Solve for x\newlineCalculation: 9x=(6x8)5+745x=6x8+3545x6x=2739x=27x=27399x = \frac{(6x - 8)}{5} + 7 \Rightarrow 45x = 6x - 8 + 35 \Rightarrow 45x - 6x = 27 \Rightarrow 39x = 27 \Rightarrow x = \frac{27}{39}