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2 years ago

15 POINTSSSSSS!!!

Mathematics

2 answers:

Reika [66]2 years ago

8 0

Answer:

a + b + c = 15

a + 2xb

2xb + -20c

<h3>For the first number, it is 7</h3><h3>For the second number, it is 14</h3><h3>For the third number, it is -6</h3>

<em><u>MATH CHECK:</u></em>

14 - 20 = (-6)

14 + (-6) = 8

8 + 7 = 15

<h3>THIRD NUMBER = (-6)</h3>

Natali [406]2 years ago

5 0

x+y+z=15

y =2x

z=y-20

substitute these equations into the first

x+2x+y-20 =15

now substitute 2x in for y

x + 2x +2x-20 =15

combine like terms

5x-20 =15

add 20 to each side

5x = 35

divide by 5

x=7

y =2x

y =14

z = y-20

z=14-20

z=-6

The third number is -6

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