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likoan [24]
3 years ago
13

Solve it please 72:8

Mathematics
1 answer:
amm18123 years ago
3 0
9:1 because you divide both sides by 8. Hope this helps :)
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7x - y = - 1 + -7x + 3y = - 25
Fittoniya [83]
Hope this helps you out :D

It’s 2 equations so in order to solve the previous system, you can use different methods, as for example substitution or addition of equations. In this case, you use the second one, due to the fact you have 7x in one equation and -7x in the other equation. In this way you can easily eliminate variable x and then solve for y. With the value of y you can replace in any of the two equations and solve for x.

7x-y=-1
-7x+3y=-25

Summarizing, you proceed as follow:
- add up the given equations

7x - y = -1

-7x+3y=-25
——————
0 +2y=-26

- solve for y in the previous equation

2y=-26
y=-26/2
y=-13


- replace the obtained value of y in one of the given equations, and solve for x

7x-(-13)=-1

7x+13=-1

7x=-1-13

7x=-14

x=-14

x=-14/7

x=-2


Hence, the solution of the given systems of equation is:

X=-2

Y=-13

4 0
3 years ago
Simplify (4.5)(5)(−2).<br><br> 45<br> 4.5<br> −4.5<br> −45
Zina [86]

Answer:

-45

Step-by-step explanation:

(4.5)(5)(-2)=-45

therefore the answer would be the fourth option which is -45

3 0
2 years ago
Cuanto es 3/4 × 5/6 ​
marshall27 [118]

Answer:0.625 or 5/8

Step-by-step explanation:

6 0
3 years ago
Solve for c. 3abc + b = 5
Anastasy [175]

Answer:

Step-by-step explanation:

7 0
2 years ago
*Due tonight, plz help*
Eduardwww [97]

Answer:

y° = 7°

Step-by-step explanation:

 (8y +4) +(8y +4) +(8y +4)=180°   ( Equilateral Triangle)

24y +12= 180°

24y= 180-12

y=7°

8 0
2 years ago
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