Question 661442



{{{7y = 8x - 14}}} you know {{{y = 6}}}, so: 

{{{7*6 = 8x - 14}}} ; calculate {{{7*6}}}

{{{ 42 = 8x - 14}}} ; add 14 to both sides 

{{{56 = 8x}}} ; divide both side by {{{8}}} 

{{{7 = x}}} ; turn around the equation 

{{{x = 7}}} .....proven