Ask question

Ask question

All categories

2 years ago

6

Please explain . solve the system by elimi ation -x-18y=-3 7x-9y=21

1 answer:

Triss [41]2 years ago

5 0

This is the answer to the question

You might be interested in

Solve.<br> y=x - 7<br> 5+2y=7

lesantik [10]

Answer:

$\huge\boxed{x=8;\ y=1\to(8;\ 1)}$

Step-by-step explanation:

$\left\{\begin{array}{ccc}y=x-7&(1)\\5+2y=7&(2)\end{array}\right\\\\\text{Substitute (1) to (2) and solve for x:}\\\\5+2(x-7)=7\qquad\text{use the distributive property}\\\\5+(2)(x)+(2)(-7)=7\\\\5+2x-14=7\\\\2x+(5-14)=7\\\\2x-9=7\qquad\text{add 9 to both sides}\\\\2x-9+9=7+9\\\\2x=16\qquad\text{divide both sides by 2}\\\\\dfrac{2x}{2}=\dfrac{16}{2}\\\\\boxed{x=8}$

$\text{Substitute it to (1):}\\\\y=8-7\\\\\boxed{y=1}$

8 0

3 years ago

Read 2 more answers

What type of number is 0? Rational, Irrational, Whole number, Integer

gladu [14]

It is a whole number and integer.

4 0

3 years ago

Read 2 more answers

Naomi and Stefan are selling pies for a school fundraiser. Customers can buy cherry pies and pumpkin pies. Naomi sold 11 cherry

allsm [11]

Answer:

is there a pic?

Step-by-step explanation:

6 0

3 years ago

krok68 [10]

Answer: A

Step-by-step explanation:

Considering the 45-45-90 triangle, we know the shared side has length $3\sqrt{2}$ .

So, considering the 30-60-90 triangle, we know $x=\frac{3\sqrt{2}}{2}$

6 0

1 year ago

A customer buys a refrigerator for $650 and must pay a sales tax of 6% of the cost. What is the total cost of the refrigerator?

tankabanditka [31]

Answer:

A

Step-by-step explanation:

because he is rich

5 0

2 years ago