solve for x in the two equations below using substitution: 30x-5y=150, 60x+5y=750

Question

solve for x in the two equations below using substitution:  30x-5y=150,   60x+5y=750

anonymous · Answer

$ 30x-5y=150 \implies y=6x-30$

Sub into the other equation

$60x+5(6x-30)=750 $

Solve for $x$

amorfide · Answer

there is no way i would do this by substitution sorry

apoorvk · Answer

30x-5y = 150, 
or, 30x-150 = 5y
or, y = (30x-150)/5
or, y = 6x-30 ....(i)

substitute the value of 'y' from 'i' above in the second equation provided, and solve x like any simple equation then. plug in the value of 'x' you get in 'i' above after that, to find out the corresponding 'y'.