Step-by-step explanation:
5x-3y-4=0---------(1)
Slope = - coefficient of X/ coefficient of y
= -5/(-3)
= 5/3
(x1,y1)= (-5,7)
Equation of the line,
Y-Y1= slope(X-X1)
Y-7= (5/3)×(X-(-5))
Y-7= (5x+25)/3
3y-7=5x+25
5x-3y+32=0 is the required eqn
10% of 80 = 8
80 - 8 = 72
if they are 10% off, the contact lenses will cost $72
8c + 6j = 5p Subtract 6j from both sides
8c = 5p - 6j Divide both sides by 8
c = 
First : -(-6) will turn into a positive 6
second: -8+6 which equals -2
