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lilavasa [31]
3 years ago
14

How do I Solve this by substitution?

Mathematics
1 answer:
riadik2000 [5.3K]3 years ago
7 0

If\ y=x+3\ and\ y=2x+4,\ then\\\\x+3=2x+4\qquad\text{subtract 3 from both sides}\\\\x=2x+1\qquad\text{subtract 2x from both sides}\\\\-x=1\qquad\text{change the signs}\\\\x=-1\\\\\text{put the value of x to the first equation}\\\\y=-1+3=2\\\\Answer:\ \boxed{x=-1,\ y=2\to(-1,\ 2)}

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Pls help with these questions!
Vilka [71]

Answer:

I don't know sorry

5 0
3 years ago
Find the product (7m^2-3m-7)(m^2-7m-6)​
earnstyle [38]

Answer:

7m^4-52m^3-28m^2+67m+42

Step-by-step explanation:

(7m^2-3m-7)(m^2-7m-6)

7m^4-3m^3-7m^2-49m^3+21m^2+49m-42m^2+18m+42

7m^4-3m^3-49m^3-7m^2+21m^2-42m^2+49m+18m+42

7m^4-52m^3-28m^2+67m+42

4 0
3 years ago
Si una persona aprovecha un descuento del 20% y paga 60.000 pesos por una camisa,¿Cuál era el precio de la camisa sin el descuen
oksano4ka [1.4K]

Answer:

the price of the shirt without discount is 75,000 pesos

Step-by-step explanation:

The computation of the price of the shirt without discount as follows:

There is a discount of 20%

And the person pays 60,000 pesos after considering the discount

So, the price without discount is

= 60,000 pesos ÷ 0.80

= 75,000 pesos

hence, the price of the shirt without discount is 75,000 pesos

6 0
3 years ago
Choose the expression that completes the equation.
worty [1.4K]
The correct answer would be 3(7+1) because 7+1=8 and 8 times 3 equals 24. 24 divided by six is 4 plus 20 would also be 24.
5 0
4 years ago
Which expression means the sum of 5 and a number? A. g × 5 B. g – 5 C. g + 5 D. g ÷ 5
wel
For this case, the first thing you should do is define a variable.
 We have then:
 g: unknown number.
 We now write the expression in algebraic form.
 the sum of 5 and a number:
 g + 5
 Answer:
 
An expression that means the sum of 5 and a number is:
 
C. g + 5
5 0
3 years ago
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