Answer:

Step-by-step explanation:
step 1
if 1,584 is decreased by 18%
we know that

Multiply the number by 0.82

step 2
The number 1,298.88 is increased by a 19%
we know that

Multiply the number by 1.19

He uses 2/3 of a gallon each hour he works.
-4x + y = 6
-5x - y = 21
add both of them
-9x = 27
x = -3
(-4*-3) + y = 6
-12 + y = 6
y = 18
2x - 4y = 32
2x - 8y = 48
2x - 2x - 4x - (-8y) = 32 - 48
4x = -16
x = -16 ÷ 4
x = -4
substitute your value of x into any of the original equations
2 (-4) - 4y = 32
-8 - 4y = 32
-4y = 32 + 8
-4y = 40
y = 40 ÷ -4
y = -10
The answer to your question is x=8