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Artist 52 [7]
2 years ago
14

PLEASE HELP!!!!!!!!!!!!!!!!

Mathematics
1 answer:
rodikova [14]2 years ago
8 0

Answer:

Step 2

Step-by-step explanation:

Don't Question It

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Use substitution to solve the following system of equations. What is the value of y? {3x+2y=12{5x−y=7 A) y = -3B) y = 3C) y = -2
Vlad [161]

<em>Answer</em>

B) y = 3

<em>Step-by-step explanation</em>

Given the system of equations:

\begin{gathered} 3x+2y=12\text{ \lparen eq. 1\rparen} \\ 5x-y=7\text{ \lparen eq. 2\rparen} \end{gathered}

Isolating x from equation 1:

\begin{gathered} 3x+2y-2y=12-2y \\ 3x=12-2y \\ \frac{3x}{3}=\frac{12-2y}{3} \\ x=\frac{12}{3}-\frac{2}{3}y \\ x=4-\frac{2}{3}y\text{ \lparen eq. 3\rparen} \end{gathered}

Substituting equation 3 into equation 2 and solving for y:

\begin{gathered} 5(4-\frac{2}{3}y)-y=7 \\ 5\cdot4-5\cdot\frac{2}{3}y-y=7 \\ 20-\frac{10}{3}y-y=7 \\ 20-\frac{13}{3}y=7 \\ 20-\frac{13}{3}y-20=7-20 \\ -\frac{13}{3}y=-13 \\ (-\frac{3}{13})\cdot-\frac{13}{3}y=(-\frac{3}{13})\cdot-13 \\ y=3 \end{gathered}

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1 year ago
An isosceles triangle has legs that measure 10 feet. If the height of the triangle is 7 feet, find the length of its base
irinina [24]

Answer:

14.2 feet

Step-by-step explanation:

I rounded off to 1 decimal place

8 0
3 years ago
Anyone have any idea what it could be?
Ronch [10]
The answer is B because 90 to 30 is 3 over 2
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What is the axis of symmetry for the parabola with the equation y=2x^2
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The axis of symmetry would be x=0
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Answer:

yes

Step-by-step explanation:

6 0
2 years ago
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