$\left\{\begin{array}{ccc}-3x+y=6&|\text{add 3x to both sides}\\5x+2y=23\end{array}\right\\\\\left\{\begin{array}{ccc}y=3x+6\\5x+2y=23\end{array}\right\\\\\text{substitute}\ y=3x+6\ \text{to the second equation}\\\\5x+2(3x+6)=23\qquad|\text{use distributive property}\\\\5x+(2)(3x)+(2)(6)=23\\\\5x+6x+12=23\qquad|\text{subtract 12 from both sides}\\\\11x=11\qquad|\text{divide both sides by 11}\\\\\boxed{x=1}\\\\\text{subtract the value of x to the first equation}\\\\y=3(1)+6\\\\y=3+6\\\\\boxed{y=9}$

<h3>Answer: x = 1 and y = 9 → (1, 9).</h3>

4 0

3 years ago

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What percent of 20 is 11

Jet001 [13]

'is' in mathematics means equal
'of' in mathematics means multiplication

$\frac{x}{100} \times 20 = 11\\\\\frac{x}{5} = 11\\\\\boxed{\bf{x = 55}}$

55% of 20 is 11.

6 0

3 years ago

PLEASE HELP RN I NEED THIS THIS IS VERY IMPORTANT ITS A TYPING ANSWER

m_a_m_a [10]

Hey there! Here's your answer:

Here's why:

PQRST is not a scale copy of ABCDE because the sides are not increased proportionally. A scale copy of a figure is a figure that is geometrically similar to the original figure. This means that the scale copy and the original figure have the same shape different sizes.

3 0

2 years ago