Help This step works because of the ______

Mathematics

2 answers:

lisov135 [29]3 years ago

5 0

I think it's 'b'. Sorry if I'm incorrect. ^^;

solong [7]3 years ago

5 0

This works because of the addition property of equality
a=16--->a+3=16+3
reverse engineering
a+3=16+3--->a=16
now given that 5x-4y=-30
and given also the equation 3x+4y=38
by the addition property
3x+4y+(-30)=38+(-30)
since -30=5x-4y by substituting
3x+4y+(5x-4y)=38-30
which yields
8x=8
the addition property of equality which is B.

You might be interested in

There are 130 people in a sport centre. 73 people use the gym. 62 people use the swimming pool. 58 people use the track. 22 peop

Maru [420]

p(the person does not use any facility)= 59/130

6 0

3 years ago

Solve by using the perfect squares method. x2 + 4x + 4 = 0 a. 2 b. –2 c. 4 d. –4

Assoli18 [71]

Solve your equation step-by-step.

x2+4x+4=0

Factor left side of equation.

(x+2)(x+2)=0

Set factors equal to 0.

x+2=0

or

x+2=0

x=−2

7 0

3 years ago

Read 2 more answers

Is it A B C D Will be marked as crown

Solnce55 [7]

The answer is B just took the test

3 0

3 years ago

Read 2 more answers

X - 3y = 6 and x - 3y = 9

Kruka [31]

The answer is that there are no solutions to the equations. They are parallel to each other and never cross. They can also be called inconsistent

6 0

3 years ago

Write the explicit formula for the geometric sequence. a1 = -5 a2 = 20 a3 = -80

Anni [7]

$a_1 = -5;\ a_2 = 20;\ a_3 = -80 \\\\a_2:a_1=r\ and\ a_3:a_2=r\\\\r=20:(-5)=-4\ check\ r=-80:20=-4\\\\a_n=a_1r^{n-1}\to a_n=-5\cdot(-4)^{n-1}=-5\cdot(-4)^{-1}\cdot(-4)^n\\\\=-5\cdot\left(-\dfrac{1}{4}\right)\cdot(-4)^n=\dfrac{5}{4}\cdot(-4)^n\\\\Answer:\boxed{a_n=-5\cdot(-4)^{n-1}\ other\ a_n=\frac{5}{4}\cdot(-4)^n}$

6 0

3 years ago