2 X + 3 Y=_ 4
_ 5 x + 4 Y + 13 =0

X = -10

Y = 8

2 X + 3 Y = 4 (i)

5 X + 4 Y + 13 = 0 (ii)

rearranging eqn (ii), we have

5X + 4Y = -13 (ii)

multiply eqn (i) by 5 and eqn (ii) by 2

10X + 15Y = 20 (iii)

10X + 8Y = -26 (iv)

subtracting eqn (iv) from (iii), we have

10X - 10X + 15Y - 8Y = 20 - (-26)

0 + 7Y = 20 + 26

7Y = 56

Y = 56/7

Y = 8

Substituting Y into eqn (i), we have

2X + 3Y = 4

2X + 3(8) = 4

2X + 24 = 4

2X = 4 - 24

2X = -20

X = -20/2

X = -10

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870