How do I solve 2x+3y=7, x-y=1

Answers

Answer 1

Answer: 2x+3y=7
x-y=1

2x+3y=7
x=1+y

2*(1+y)+3y=7
x=1+y

2+2y+3y=7
x=1+y

5y=5 |(:5)
x=1+y

y=1
x=2

CHECK:
2x+3y=7
x-y=1

2*2 + 3*1 = 7

x-y = 1
2-1 = 1

Answer 2

Answer: 2x+3y=7
2(2)+3y=7
4+3y=7
subtract 4 from both sides
3y=3
divide both side by 3
y=1

2x+3y=7
2x+3=7
2x+3y=7
subtract 3y from both sides
2x=7-3y
divide both side by 2
x=3.5-1.5
x=2

then you do the x-y=1

x-y=1
2-1=1
1=1

in the end both answers are 1 so that means that i did it right. that means that x=2 and y=1

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Answers

Answer:

The answer is 2,3,4,6

Step-by-step explanation:

Here is proof! Hope you pass<33

Answer:

2nd option is correct as it has represented all the terms of the expression.

F (x) = cx + 3In the function above, c is a constant. If f (1) = 1, what is the value of f (-4) ?

Answers

If f(1) = 1 that means c is -2 because when you substitute x = 1 and when c = -2, you'll get f(1) = -2(1)+3 = -2+3 = 1

So the constant c is -2 and that means the value of f(-4) is

f(-4)=-2(-4)+3=8+3=11

Thus, the value of f(-4) is 11.

About why does "c" have to be -2, here's the proof.

Given y = f(x), therefore.

y=cx+3

Since when x = 1 and y = 1, then Substitute x = 1 and y = 1, thus 1 = c+3

1 - 3 = c and therefore, -2 = c #

So this is the proof that c = -2

How many zeros would you find at the end of 100!, fi you ex- pandeditoutinbaseten?

Answers

Answer:

Hope this helps! :)

You would find 24.

If a/b = 2 /5, b/c = 3 /8, a/c =??

Answers

Answer:

3/20

Step-by-step explanation:

By question it's given that ,

$\implies (a)/(b)=(2)/(5)$

$\implies (b)/(c)=(3)/(8)$

And we need to find out the value of a/c .For that Multiply both of them , we have ;

$\implies (a)/(b) *(b)/(c)=(2)/(5)* (3)/(8) \n\n\implies (a)/(c)= (3)/(20)$

Hence therequired answer is3/20.

Zach brought two jet skis for $15,480 He will make 36 equal payments. How much will each be?

Answers

15,480 divided into 36 payments is $430 per payment

He will pay $430 each for his jet skis.

Choose the correct simplification of the expression a to the 7th power times b to the 8th power all over a to the 4th power times b to the 4th power

Answers

First you need to write the numerical equation for the given:

$( a^(7) b^(8) )/( a^(4) b^(4) )$

When you will simplify this fraction, you can divide the expressions. Based on the law of exponents when you divide like terms with different exponents, you can subtract the exponents of the denominator from the numerator.

So if you will simplify the equation:

$( a^(7) b^(8) )/( a^(4) b^(4) )$

Subtract the following:

Exponents of a 7-4 and;
Exponents of b 8-4

Your answer should be
$a^(3) b^(4)$

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Jorge bought a new computer for $399 and extra computer memory for $42. Give the percentage of the total amount that Jorge spent was the cost of the computer? Round to the nearest tenth of a percent, if necessary. A. 9.5% B. 10.5% C. 90.5% D. 92.6%