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3 years ago

I forgot how to solve equations such as 3x+5y=-5. Can you give me examples?

2 answers:

7 0

Well 3x is 3 times if they are together beside each other that mean they are multiplying so 3 times x plus 5times y = -5

quester [9]3 years ago

5 0

You want to solve for x.

3x+5y=-5
3x=-5-5y
x=-5/3 - 5/3y

Harder than it looks.

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6x+3(4x-2)=5(2x-8) the answer is -17/4 but can someone explain how to get that answer? plz help lol

Sergeu [11.5K]

Answer:

Step-by-step explanation:

$6x + 3(4x - 2) = 5(2x - 8)$

Expand the terms in the bracket and simplify

That's

$6x + 12x - 6 = 10x - 40 \\ 18x - 6 = 10x - 40$

Using the subtraction property subtract 10x from both sides of the equation

$18x - 10x - 6 = 10x - 10x - 40 \\ 8x - 6 = - 40$

Add 6 to both sides of the equation

$8x + 6 - 6 = - 40 + 6 \\ 8x = - 34$

Divide both sides by 8

$\frac{8x}{8} = - \frac{34}{8}$

Reduce the fraction with 2

We have the final answer as

$x = - \frac{17}{4}$

Hope this helps you

7 0

3 years ago

A and b are positive integers. Find <img src="https://tex.z-dn.net/?f=-2a%2B3b" id="TexFormula1" title="-2a+3b" alt="-2a+3b" ali

lord [1]

A could be 2 while B could be 3, so -2a+3b turns into -4+9, which equals 5.

From what I know you can't really solve a a single equation with two-variables so it's just a matter of trial and error.

Just try plugging in a small number like 2 for a just to try it and you get 8b^2=72.

Divide everything by 8 to isolate b and you get that b^2=9.

Square root everything and you'll find that b=3. This is just one possible combination, I'm sure there are many more but this is obviously the one that was intended to be found.

Now that we know that a=2 and b=3 just plug them into the equation.

-2(2)+3(3)=?

-4+9=?

Sorry about having to use this ^ symbol, the equation maker is not working.

7 0

3 years ago

I need help with writing a word problem that can be evaluated by the algebraic expression 372 + r, and evaluate it for r = 137.

Soloha48 [4]

Gabe had 372 apples and r grapes. The total of grapes and apples gabe has are 509. How many grapes did gabe have?

4 0

3 years ago

Int he figure below find AC

Ahat [919]

Given :-

Two triangles with their two angles equal .

To Find :-

Measure of AC .

Answer :-

Here in ∆ABC and ∆EDC ,

$\angle$ CAB = $\angle$ CED (given )
$\angle$ CBA = $\angle$ CDE (given)

Therefore by AA similarity criterion , we can say that ∆ABC ~ ∆EDC . Also we know that corresponding sides of similar triangles are proportional . So ,

→ AC/EC = BC/DC

→ AC/9 = 8/12

→ AC = 8/12 * 9

→ AC = 6

Hence the measure of side AC is 6 .

I hope this helps.

7 0

2 years ago

Mae has 36/4 inches of red yard to use for hair on dolls she is making. She uses 9/2 ounces for each doll. How many dolls can ha

enyata [817]

Answer: 2 dolls

Step-by-step explanation: got it right

6 0

3 years ago