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34kurt
3 years ago
10

X+3y=-5 4x-y=6 solve by elimination please

Mathematics
1 answer:
const2013 [10]3 years ago
4 0
Multiply the second equation by 3, so 4x-y=6 becomes 12x-3y=18.

x + 3y = -5
+ (12x-3y = 18)
______________
13x = 13

So x = 1

Plug x = 1 into any of these, such as 1 + 3y = -5, which becomes 3y = -6, and then y = -2.
x = 1
y = -2
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8 0
3 years ago
Read 2 more answers
HURRY HELP PLS‼️‼️‼️
Brums [2.3K]

Answer:

Step-by-step explanation:

To solve this problem you need the function

 

h(t) = -16t2 + v0t + h0

where t = time

v0 is the initial velocity, which in our case is 0

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h(t) = 0 since we want to know when the ball will hit the ground.

 

0 = -16 t2 + 256

 

And we can solve for t

 

If we rearrange the terms we see that this is a difference of 2 squares

0 = 256 - 16t2

 

0 = (16-4t)(16+4t)

Setting each factor = 0

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The second solution is discarded as time cannot be negative.

 

So the ball will hit the ground in 4 seconds.

6 0
2 years ago
Jack got the expression 7x+1 and then wrote his answer as 1+7x . is his answer an equivalent expression? how do you know?
Solnce55 [7]
True. According to the Commutative Property <span>of addition, the numbers could be put in any order and still result in the same answer. </span>



3 0
2 years ago
What is the actual slope of this line?
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Answer:

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Step-by-step explanation:

The line has a "rise" between the two points of -4 units for a "run" of +1 unit. The slope is the ratio ...

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The slope is -4.

_____

<em>Additional comment</em>

A "whole number" must be non-negative. Here, the slope is negative. If you're restricted to "a fraction or a whole number", then the appropriate answer is the fraction -4/1. We suspect that "integer" is meant where "whole number" is used.

5 0
2 years ago
What is 6(m + 4) =_m +_
Zielflug [23.3K]

Answer:

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Step-by-step explanation:

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6 times m is 6x

6 times 4 is 24

soo

6m+24 is correct

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5 0
3 years ago
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