3x + 4y = 7, 8x + 5y = 12. The value of x and y is 13, 20
20, 13
13/17, 20/17
20/17, 13/17

13/17, 20/17

Step-by-step explanation:

3x + 4y = 7 --- Equation 1

Equation 1×5:

15x + 20y = 35 --- Equation 2

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8x + 5y = 12 --- Equation 3

Equation 3×4:

32x + 20y = 48 --- Equation 4

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Equations 4-2:

32x + 20y - 15x - 20y = 48 - 35

17x = 13

x =

Substitute x = into Equation 1:

3x + 4y = 7

3() + 4y = 7

+ 4y = 7

4y = 7 -

    = -

    =

y =   ÷ 4

y =

Thus, x = , y = .

( , )

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

: )

rotation point l

step-by-step explanation: