Given the system of equations,

Mathematics

1 answer:

Gwar [14]2 years ago

8 0

Answer:

Step-by-step explanation:

$\underline{+\left\{\begin{array}{ccc}x+2y=7\\x-2y=-1\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad\qquad2x=6\qquad\text{divide both sides by 2}\\.\qquad\qquad\boxed{x=3}\\\\\\\text{Put the value of x to the first equation:}\\\\3+2y=7\qquad\text{subtract 3 from both sides}\\2y=4\qquad\text{divide both sides by 2}\\\boxed{y=2}$

You might be interested in

What percent of 71 is 90? of 71 is 90.

sashaice [31]

Answer: 126.76056338%

Step-by-step explanation: To answer the question what percent of 71 is 90, we translate the question into an equation.

We have "what percent" which we can represent by the variable X. Next we have "of 71" which means "times 71" and "is 90" means "equals 90."

Now to solve for x, since x is being multiplied by 71, we need to divide by 71 on both sides of the equation.

On the left side of the equation the 71's cancel and we have x. On the right side of the equation we have 90 divided by 71 which is 1.2676056338.

Now, remember that we want to write our answer as a percent. To write 1.2676056338 as a percent, we move the decimal point two places to the right and we get 126.76056338%.