Answer:
1.
Step-by-step explanation:
y=19x+4
First 168 is with the discount
The tax is 11.76
168+ 11.76 is 179.76
0.2x+0.2+0.5x=-0.3x+1.2
0.7x+0.3x=1.2-0.2
x=1
That's your answer.
Two numbers that add together to get 0 are called additive inverses of each other.