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4 years ago

-3x+3y=3 -5x+y=13 Solve for substitution

1 answer:

vladimir1956 [14]4 years ago

8 0

Take -5x + y =13 and rearrange for y:
y=13+5x

Substitute into other equation for y:
-3x+3(13+5x)=3

Multiply out brackets:
-3x+39+15x=3

Simplify:
12x+39=3

Rearrange for x:
12x=-36
x=-3

Substitute back into y=13+5x:
y=13+5(-3)
y=13-15
y=-2

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What is the difference in length between 1 2/8 inch and a 3/8 inch button?

wel

The difference is 7/8 because difference means subtract and

1 2/8-3/8
=7/8

Hope this helped.

8 0

3 years ago

(X+15)+(x+5)+(x+15)+(X+5)

Annette [7]

Answer:

4 + 4 0

Step-by-step explanation:

Simplify

Eliminate redundant parentheses

( + 1 5 ) + ( + 5 ) + ( + 1 5 ) + ( + 5 )

Add the numbers

Combine like terms

Solution

4 + 4 0

6 0

3 years ago

PLEASEE HELP ME 60 POINTS!!!

kompoz [17]

Answer:

1. No Solution

2. One solution

3. Infinitely many solutions

Step-by-step explanation:

Let us try to solve each of the system of equations one by one.

1. $y =-4x - 5$

$y = -4x + 1$

This gives

$-4x- 5 = -4x + 1$

which has no solutions.

2. $-3x+y=7$

$2x-4y=-8$

let us write them in y-intercept form

$y=3x+7$

$y=\frac{1}{2}x+2$

and equate them

$y=3x+7=\frac{1}{2}x+2$

this gives $x=-2$ and

$y=-3(-2)+7 = 1$

This equation has solutions.

3. $3x-y=4$

$6x-2y =8$

Notice that the second equation is just the first equation multiplied by 2, or

$2(3x-y=4)\rightarrow (6x-2y=8)$

<em>so these are identical equations and therefore</em> this system has infinitely many solutions.

Thus we have

1. No Solution

2. One solution

3. Infinitely many solutions

3 0

3 years ago

One number is eight less than a second number. Five times the first is 6 more than 6 times the second. Find the numbers. The val

Ilia_Sergeevich [38]

Answer:

I think the value of first number is 30.

4 0

3 years ago

What is 10x5/6 pls helppp thank you

mote1985 [20]

Answer:

The answer has many ongoing 3's so just shorten it to

8.3 or 8.33

4 0

3 years ago