Can anyone help me with this math problem

Mathematics

1 answer:

Gnoma [55]3 years ago

5 0

Answer:

B.)

Step-by-step explanation:

In step #1 they did the distributive property

2/5 × 15x = 6x

2/5 × -30y = -12y

The new equation would be:

6x - 12y + 10x

Further Explanation

They then combined 6x + 10x to get 16x

16x - 12y

They then factored it out to 4(4x - 3y)

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Help ASAP please now please don’t comment unnecessary

Georgia [21]

Answer:

Hope that helps!!

18.84x

3 0

3 years ago

Hello I don’t understand question 9 a and b. Please show working out. Thanks

brilliants [131]

A) I would make the positive integer x and then form an equation.

x + 30 = x^2 - 12
x + 42 = x^2
0 = x^2 - x - 42 this can be factorised
(x - 7) ( x + 6) Therefore x = 7 or x = -6

Since the question asks for a positive integer the answer is 7.

B) two positive numbers x and y.

X - y = 3
x^2 + y^2 = 117

Use these simultaneous equations to figure out each number.

Rearrange the first equation

x = y + 3

Then substitute it into the second equation.

(y+3)^2 + y^2 = 117
y^2 + 6y + 9 + y^2 = 117
2y^2 + 6y - 108 = 0
then factorise this.
(2y - 12) (y + 9)

This means that y = 6 or y = -9 but it’s 6 because that’s the only positive number.

Use y to find x

x = y + 3
x = 6 + 3
x = 9

So the answers are x = 9 and y = 6.

3 0

3 years ago

Will vote

tia_tia [17]

The answer is 1 to 3

6 0

3 years ago

ΔEFG is located at E (0, 0), F (−7, 4), and G (0, 8). Which statement correctly classifies ΔEFG?

MariettaO [177]

Answer:

ΔEFG is an isosceles triangle.

Step-by-step explanation: