Answer: Solution x=27, y-7.2
(1) 2x + 5y= 18
(2) 4x + 20y= -36
Multiply equation (1) by -2:
(1) -4x - 10y= -36
(2) 4x + 20y= -36
Add (1) to (2):
(2) 4x + 20y -4x - 10y = -36 -36
-> 10y = -72
-> y=-7.2
Use the value for y in equation (1) to get x:
(1) 2x + 5(-7.2) = 18
2x -36 = 18
2x = 54
x = 27
Solution (x,y)=(27,-7.2)
Answer:
Therefore, lowest rationalizing factor is ( 7 + √7 ).
Step-by-step explanation:
follow me
mark me as BRAINLIEST
100%sure
Answer:
T=12500-0.25y
Step-by-step explanation:
Step one:
given data
The value of the car is $12500.
let the value of the previous year be T
let the number of years be y
25% will be 0.25----this is equivalent to the gradient
The expression for the change in price can be represented linearly using the equation of a straight line,
y=mx+c
but since the price is reducing the expression becomes
y=-mx+c
Now, in this situation the expression for the cost after y years is
T=-(0.25y)+12500
rearrange
T=12500-0.25y
<u>The expression is T=12500-0.25y</u>