Find x and y, if
a) (x + y, 3) = (1, x-y)
c) (x-2, y + 1) = (1, 0)

a) x=2, y=-1

Step-by-step explanation:

Make x+y=1 equations number 1 And

x-y=3 another

x+y=1

x=1-y

then substituting the value of x in equations 2

We get,

x-y=3

1-y-y=3

-2y=3-1

y=2/-2

=-1

taking equations 1

x+y=1

x-1=1

x=2

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6