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SVETLANKA909090 [29]
3 years ago
6

Solve the following Systems of Equations by Substitution or Elimination

Mathematics
1 answer:
Likurg_2 [28]3 years ago
7 0

Answer:

(-1,2)

Step-by-step explanation:

y = -2x ______(1)

7x - 8y = -23 ________(2)

Substituting the value of y in eqn.(1) into eqn (2);

7x - 8(-2x) = -23

7x + 16x = -23

23x = -23

x = -1

y = -2(-1) = 2.

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Romashka [77]
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7 0
3 years ago
The sum of two numbers is 62, and their difference is 8. What are the numbers
Lemur [1.5K]
Sum of two numbers is 62?
Let's call the two numbers a and b

let's find two same numbers that would add up to 62: 31.
31 + 31 = 62

since it said the difference is 8, we have to add 4 to one number and subtract 4 from another.
31 - 4 = 27
31 + 4 = 35

Therefore, the two numbers following the given rules are 27 and 35
7 0
3 years ago
Anyone know this one I’m kinda bad at math lol
swat32

Answer:

1/ 9^5

Step-by-step explanation:

When dividing exponents with the same base, subtract the exponents

9^2 / 9^7

9 ^ (2-7)

9^ -5

We know that a^ -b = 1/ a^b

1/ 9^5

8 0
3 years ago
Read 2 more answers
This is just the first pic of the problem I’m posting the second one right after this
ale4655 [162]

Answer:

A. rise = 4, run = 1, slope = 4

B. rise = 8, run = 2, slope = 4

C. A (Yes, they are equal because similar)

Step-by-step explanation:

i hope this is right

4 0
2 years ago
Find all the zeros of x^3-5x^2-x+5
AnnyKZ [126]
The fact that the coefficients are pairwise identical (except for sign) tells you that x^2 -1 is a factor (and x-5 is the other factor). Of course, you recognize x^2-1 as a special form (the difference of squares) that is factored as (x +1)(x -1).

The zeros are x = -1, +1, +5.

___
A graphing calculator confirms this.

3 0
3 years ago
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