Y=-5
5x+4y=-20
it say solve by substitution

Answers

Answer 1

Answer: $y=-5\n5x+4y=-20 \n\n5x+4 \cdot (-5)=-20 \n\n5x-20=-20\ \ | \ add\ 20\ to\ both\ sides \n\n5x=0 \ \ | \ divide \ both \ sides\ by\ 5\n\nx=0$

Answer 2

Answer: 5x + (4 · -5) = -20
5x - 20 = -20
5x = 0
x = 0

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Solve this equation
3x+5y=26
2x-y=13

Answers

Okey I help you

3x+5y=26
5*/2x-y=13

3x+5y=26
10x-5y=65
+------------------

13x= 91
x=7

3x+5y=26
3*7+5y=26

5y=5

y=1 ,,

Hope it helps :))

Which set of ordered pairs does not represent a function?O{(-2,5), (0, -9), (8,-2), (7,4)}
O{(-3,4), (-5,4), (7, -3), (2, -9)}
O {(2, -9), (-5, -1), (-6, -3), (-5,7)}
O {(1, -8), (-9,-2), (-4,0), (4, -8)}

Answers

Step-by-step explanation:

{(2, -9), (-5, -1), (-6, -3), (-5,7)}

-5 appears twice ( this is not allowed for the function)

Tell wether the the graph of each quadratic functions opens upward or downward y=-3x^2+4x Y=1-2x+6x^2 Y+x^2=-x-2 Y+2=x^2 Y-2x^2=-3 Y+2+3x^2=1

Answers

Hello,
all you have to see is the coefficient of x²:
if positive: upward
if negative : downward

y=-3x²+4x ==> -3: downward

y=1-2x+6x² ==>6 : upward

y+x²=-x-2==>y=-x²-x-2 ==> -1: downward

y+2=x² ==>1: upward

y-2x²=-3==>y=2x²-3 ==> 2: upward

y+2+3x²=1==>y=-3x²-1 ==> -3: downward

My brain doesn't feel like working today ;-;

I just need the equation, not the answer

Answers

Answer:

area = lengh x width is that enough of the formula? :D

Step-by-step explanation:

I'll give you the rest, just in case :P My brain got tired at the break before spring, here is the rest

400 = (L+30) X w

400 = 10+30 x 10 ( just b/c I can see 40 x 10 would be 400, calculus could also figure this out for us, but... that would be the minimum fencing he needs to buy and this questions isn't asking that, just make it fit on the back of his house, which we are not given, so just make up something, I used 10 b/c it was convenient )

400 = 40 x 10

2 sides are 40 , and one side is 10

so 90' of fence is needed

Through: (2,-3). Slope = -5/2

Answers

Sorry Idk what is the question

Which theorem proves that the triangles are congruent?A. AAS
B. ASA
C. SAS
D. SSS

Answers

Answer:

SSS

Step-by-step explanation:

We are given that the triangle has all congruent sides therefore we can prove that the triangles are similar by the SSS theorem ( side - side - side )

Answer:

D. SSS

Step-by-step explanation:

SSS (Side-Side-Side) is a proof of congruence where two triangles share three sides.

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1. The value x = 4 is a solution to all of the following equations except which?(1) 2x + 7 =15(3) x+5 = 3x-3(2) 3(x+1)= x +11(4) x+12= 5x-2