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3 years ago

P-1=5p+3p-8 how do I solve this?

Mathematics

2 answers:

erica [24]3 years ago

8 0

$p-1=5p+3p-8\\ \\p-8p=-8+1\\ \\-7p=-7\ \ /:(-7)\\ \\p=1$

Viktor [21]3 years ago

6 0

P-1=8p-8
Add 1 to both sides
p=8p-7
Subtract 8p from both sides
-7p=-7
Divide by -7
p=1

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Y=5x+4 and 3x+2y=20 by using elimination

nikklg [1K]

Answer:

Step-by-step explanation:

y = 5x + 4

-5x + y = 4 ----------------------(i)

3x + 2y = 20 --------------------(ii)

Multiply equation (i) by (-2)

(i)* (-2) 10x - 2y = -8

(ii) 3x + 2y = 20 { Now add this two equations}

13x = 12 { -2y and 2y got eliminated}

x = 12/13

Plug in value of x in (i)

-5*12/13 + y = 4

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3 years ago

Y = 3x + 15 3x + 3y = 9

Zina [86]

Answer:

$\Large\boxed{x=-3}$ $\Large\boxed{y=6}$

Step-by-step explanation:

Given the system of equations

$1)~y=3x+15$

$2)~3x+3y=9$

Divide 3 on both sides of the 2) equation

$3x+3y=9$

$3x\div3+3y\div3=9\div3$

$x+y=3$

Current system

$1)~y=3x+15$

$2)~x+y=3$

Substitute 1) equation into the 2) equation

$x+(3x+15)=3$

Combine like terms

$x+3x+15=3$

$4x+15=3$

Subtract 15 on both sides

$4x+15-15=3-15$

$4x=-12$

Divide 4 on both sides

$4x\div4=-12\div4$

$\Large\boxed{x=-3}$

Substitute the x value into one of the equations to find the y value

$y=3x+15$

$y=3(-3)+15$

$y=-9+15$

$\Large\boxed{y=6}$

Hope this helps!! :)

Please let me know if you have any questions

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Answer:

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Step-by-step explanation:

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