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2 years ago

You are given two algebraic equations, y = 3x, and 2y = x + 20. Solve for x and y.

Mathematics

1 answer:

Yuri [45]2 years ago

7 0

Answer:

x= -4 & y=-12

Step-by-step explanation:

multiply y=3x by 2

giving you 2y=6x

subtracting 2y=x+20 from 2y =6x

=> 5x=-20

dividing through by 5

=> x=-4

put x=-4 into y=3x

=> y=3(-4)

y=-12

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Use the function below to find f(-4).

Margaret [11]

Answer:

Step-by-step explanation:

f(x) = 2x

f(-4) = 2(-4) = -8

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2 years ago

Nathan and his brother Zach love to play video games. Right

Monica [59]

Answer:

$N=2Z-11$

$\begin{array}{cc}\text{Zac's score}&\text{Natan's score}\\ 6&1\\7&3\\8&5\\9&7\end{array}$

Step-by-step explanation:

Nathan's score is 11 less than 2 times Zac's score.

Let Z points be Zac's score and N points be Natan's score. then

2 times Zac's score = 2Z

11 less than 2 times Zac's score = 2Z -11

So, N = 2Z - 11

1. If Z=6, then $N=2\cdot 6-11=12-11=1$

2. If Z=7, then $N=2\cdot 7-11=14-11=3$

3. If Z=8, then $N=2\cdot 8-11=16-11=5$

4. If Z=9, then $N=2\cdot 9-11=18-11=7$

Thus, four other possibilities are

$\begin{array}{cc}\text{Zac's score}&\text{Natan's score}\\ 6&1\\7&3\\8&5\\9&7\end{array}$

3 0

3 years ago

Simplify the expression. (–5 – c)(–1) A.5 + c B.–5 + c C.5 – c D.–5 – c

Marina86 [1]

-1(-5 - c) = 5 + c <==

6 0

3 years ago

Read 2 more answers

I do not know how to do this but I need a answer cuz u don’t know it

Law Incorporation [45]

You answer would be 16.2.

Hope this helps,
♥Nikki♥

3 0

3 years ago

0.5m + 6.4 = 4.9 - 0.1m

BigorU [14]

Solve for m by simplifying both sides of the equation, then isolating the variable.
m = -2.5

5 0

3 years ago