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anygoal [31]
3 years ago
9

How do you solve systems by substitution for 3x + 3y =-4 5x=20

Mathematics
1 answer:
lina2011 [118]3 years ago
5 0
\left\{\begin{array}{ccc}3x+3y=-4\\5x=20&\ |divide\ both\ sides\ by\ 5\end{array}\right\\\\\left\{\begin{array}{ccc}3x+3y=-4\\x=4\end{array}\right\\\\substitute:\\\\3\cdot4+3y=-4\\12+3y=-4\\3y=-4-12\\3y=-16\ \ \  \ \ \ |divide\ both\ sides\ by\ 3\\y=-\frac{16}{3}\\\\Solution:x=4\ and\ y=-\frac{16}{3}\to(4;-\frac{16}{3})
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What is the best description of AB?
Wewaii [24]

9514 1404 393

Answer:

  F  altitude

Step-by-step explanation:

AB is perpendicular to triangle base XZ, so is an altitude of the triangle.

__

<em>Additional comment</em>

B is not the midpoint of XZ, so AB is not the median and not a bisector of XZ. Likewise, AB is not the angle bisector of angle A. (The triangle would have to be isosceles for AB to be a perpendicular bisector, median, and angle bisector.)

Eliminating the choices that can't work leaves the one that does work. AB is the altitude.

4 0
3 years ago
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nekit [7.7K]

60 is the amazing cool answer XD

8 0
2 years ago
Margie's car can go 32 miles on a gallon of gas, and gas currently cost $4 per gallon. how many miles can Margie drive on $20 wo
Marysya12 [62]
To do this first we will divide the amount of dollars (20) by the amount of dollars 1 gallon is for (4). Then we will multiply the amount of times 4 goes into 20 by 32 and the answer will be the amount of miles she can drive worth $20. 

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So, Margie can drive 96 miles in $20. 

Hope I helped ya!! xD 
6 0
3 years ago
What is your estimate for the number of airline flights in a year?
Firdavs [7]
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8 0
4 years ago
Tanner is ordering a pizza at a restaurant. The cost of a cheese pizza is $8.69, and then it costs $0.30 for each additional top
Grace [21]

Answer:

Option A. c=8.69+0.30t

Step-by-step explanation:

Let

t ------> the number of additional toppings

c ----> the cost of the pizza in dollars

we know that

The linear equation that represent this situation is

c=0.30t+8.69

This is the equation of the line in slope intercept form

where

the slope m is equal to

m=0.30\frac{\$}{topping}

the y-intercept  b is equal to

b=\$8.69 -----> the cost of a pizza without topping

6 0
3 years ago
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