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garri49 [273]
3 years ago
10

HELP I DONT GET IT!!!For the system below solve using linear combinations method 2a+3b=1 and -2a+b=11

Mathematics
2 answers:
son4ous [18]3 years ago
6 0
Because it using subtraction on one and multiply on the other
Maksim231197 [3]3 years ago
3 0
Linear combination method just means to add the equations so that one variable with cancel. In this case the a values are already set up so that they will cancel.
2a + 3b = 1
-2a + b = 11
4b = 12
b = 3

now put 3 back into either of the original equations and solve for a.
2a + 3(3) = 1
2a + 9 = 1
2a = -8
a = -4
(-4,3)
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GarryVolchara [31]
400 each unit is forty
6 0
2 years ago
Through (-4,6) and parallel to y=-3x+4
liraira [26]
Y=mx+b
parallel lines will have the same slope.

using the points (-4,6) and the slope for the parallel line -3 we can find b (the y intercept) for the line.

6 = (-3)(-4) + b
6 = 12 + b
-12 + 6 = -12 + 12 +b
-6 = b
so the line that runs through points (-4,6) and parallel to y= -3x+4 is:
y = -3x -6
7 0
3 years ago
72 greater than r is less than −432
pshichka [43]

its Greater than

Step-by-step explanation:

the 72 is a positive and -432 is a negative cause it has a minus

6 0
3 years ago
Assume CD | AB are parallel. Find m2.<br> A) X= 50°<br> (B) x = 70°<br> C) x = 30°<br> D) x = 60
SVETLANKA909090 [29]

Answer:

The answer is A, 50°.

Here, angle CAB= 60°.

In triangle ABC,

60°+70°+ angle ABC= 180°.

angle ABC= 50°.

3 0
3 years ago
Read 2 more answers
A diamond ring increases in value at a rate of 5% per year. If the ring was purchased for $1200, which equation would calculate
Margarita [4]

Answer:

A - y = 1200(1+.05)^30

Step-by-step explanation:

In this case, you need to calculate the future value and the formula to calculate that is:

FV=PV*(1+r)^n

FV=future value

PV=present value

r=rate

n=number of periods of time

The present value would be the price of the ring which is $1200. The rate is 5% per year and the number of periods of time is 30 years since you need to find the ring's worth in 30 years. Now, you can replace the values on the formula:

FV=1200*(1+0.05)^30

According to this, the answer is that the equation to calculate how much will it be worth in 30 years is: y = 1200(1+.05)^30.

8 0
2 years ago
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