All categories

4 years ago

Solve the system of equations x+4y=15 2x-y=-15

Mathematics

1 answer:

Lady_Fox [76]4 years ago

7 0

x+4y=15 2x-y=-15

We have to make x neg.

-2(x) + 4y (-2)= -2(15)

-2x-8y=-30

2x-y=-15

-9y= -45

Solve for y

Y=-45/-9

Y = 5

Substitute your y answer into one original equation to find x .

x+4y=15

X+4(5)=15

X+20=15

X=15-20

X= -5

Answer is (-5,5)

You might be interested in

If a temperature in degrees Celsius this is given as C finding the sum of 1.8 timesC and 33 gives the temperature in degrees Fah

aleksley [76]

Alright well first off, converting Celsius to Fahrenheit is 1.8c+32. converting Fahrenheit to Celsius is 5(f-32)/9.
the temperature in Fahrenheit is given by °f.
40°c is equal to 104°f.

3 0

3 years ago

In what time will the interest on $960 amount to $61.20 at 8.5% per annum?

MrRa [10]

Answer:

$525 dollars

Step-by-step explanation:

5 0

2 years ago

Help 4th grade math

Ymorist [56]

(32 + 18 + 13) / 3 = b

/ is divided by

you would add the boxes together and then divide them equally into the 3 displays

5 0

3 years ago

Read 2 more answers

Are the following lines parallel perpendicular or neither y=-5/3x - 5 and y=4/3x - 5

katrin [286]

Answer:

neither

Step-by-step explanation:

For lines to be parallels the slopes must be equal, for the lines to be perpendicular the lines have to be inverse reciprocals meaning if you have a slope of 1/2X then the perpendicular line must be -2X

3 0

2 years ago

Describe the transformation that maps the pre-image A to the image A.

jolli1 [7]

Answer:

C) translated 1 unit to the left and then rotated 180° counterclockwise about the origin

Step-by-step explanation:

by inspection, shape A has been translated 1 unit to the left and then rotated 180° counterclockwise about the origin

3 0

3 years ago