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3 years ago

Is 5 a solution to -3x=15

Mathematics

2 answers:

viva [34]3 years ago

3 0

Answer:

Step-by-step explanation:

Step 1: Set x to 5 and check

$-3x = 15$

$-3(5) = 15$

$-15 \neq 15$

So... 5 is not a solution

Answer: No

elena-s [515]3 years ago

3 0

Yes carry the -3x to the side wit the 15 the negative sign turns positive and u divide 15/3 to get 5

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4x – 3y=8 2. 5x – 2y = -11

AlladinOne [14]

Answer:

$x = -7$

$y = - 12$

Step-by-step explanation:

The given system is:

4x-3y=8

5x-2y=-11

We make x the subject in the top equation to get:

$x = \frac{3}{4}y + 2$

Plug this expression for x in the bottom equation to get

$5( \frac{3}{4}y + 2) - 2y= - 11$

We expand to obtain

$\frac{15}{4} y + 10 - 2y = - 11$

Multiply through by 4

$15y + 40 - 8y = - 44$

Group similar terms

$15y - 8y = - 44 - 40$

$7y = - 84$

$y = - \frac{84}{7} =-12$

This means

$x = -12\times \frac{3}{4} + 2$

$x = - 7$

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3 years ago

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FromTheMoon [43]

The answer is $45 it wasn’t that hard

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3 years ago

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Evaluate the expression 3x^2+4x^3 when x=4.

larisa [96]

Step-by-step explanation:

304

plug 4 in for x

3(4)^2 + 4(4)^3 = 304

48 + 256 = 304

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3 years ago

Twice the sum of a number and seven is eight find the number

pickupchik [31]

twice the sum of a number and seven is 8
2(x+7)=8

7 0

3 years ago

Help me ASAP!

Wewaii [24]

Answer:

200 actual miles

Step-by-step explanation:

Find the actual distance by multiplying 50 by 4, since there are 50 miles in 1 inch.

50(4)

= 200

So, there are 200 actual miles between the two cities.

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2 years ago