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arlik [135]
3 years ago
14

Use the substitution method to solve this system. y = x − 4 and -2x + y = − 7

Mathematics
1 answer:
Sergeu [11.5K]3 years ago
8 0
-2x+x-4=-7 , -1x=-3, x=3. y=3-4, y=-1
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Find the value of x.
marshall27 [118]

Answer:

  155°

Step-by-step explanation:

The obtuse angle of the large (outside) triangle is the supplement of 60°, so is ...

  180° -60° = 120°

The angle x is the sum of the remote interior angles of that large triangle:

  x = 35° +120° = 155°

__

<em>Check</em>

The other acute angle in the smaller (left) right triangle is 90° -35° = 55°. Then the top acute angle in the larger (bottom, right) right triangle is ...

  180° -55° -60° = 65°

The other acute angle in that triangle is 90° -65° = 25°. It is supplementary to angle x. Hence angle x is 180° -25° = 155°, as above. (Note that x is also the sum of 90° and 65°, the remote interior angles of the nearest right triangle to x.)

5 0
2 years ago
Five times a number increased by 8 is seven less than 6 times the number. Find the number.
maksim [4K]

Answer:

15 = x

Step-by-step explanation:

3 0
3 years ago
2. Leon bought 4 granola bars for $2. The
Mazyrski [523]
The answer is D

Explanation

.50x4=2
7 0
3 years ago
Probability and 7.10A 7.11A 7.4C 7.3C
Gre4nikov [31]

Answer:

its 67.5

Step-by-step explanation:

15+12+13= 40

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27/40 as a percent is 67.5 hope this helped! brainly?

3 0
3 years ago
The sum of a number and five times its reciprocal is 4.5. Write a quadratic equation for the number, and use the quadratic formu
g100num [7]

Answer:

x= -2 and (x+3)=0, x= -3

Step-by-step explanation:

"The sum of a number" well we do not know what the number is right, so let's call the number x. So we know we have x and we are adding it to something because it says sum. What are we adding it to? "5 times its reciprocal". A reciprocal of a number is equal to 1/the number. So the reciprocal of x is just 1/x. But we want 5 times this so multiply by 5. So now we have x + 5(1/x). Now we need to set it equal to something to be able to solve it. The problem says the sum of a number and 5 times its reciprocal is -6, so x + 5(1/x) = -6. Now just use order of operations to solve for x. First multiply: x + 5/x =-6. Then the next stperfect is harder because we want to get x by itself but we have x + 5/x. A trick you can do here is multiply the whole equation by x. This cancels out the fraction for us: x(x + 5/x) = -6(x) becomes x^2 +5 = -6x. Now we have a quadratic equation, to solve this you have to Factor or use the quadratic formula. I'll try factoring: first we need all of the terms on one side: x^2 +5x +6 =0. Now we need factors of 6 that add or subtract to 5. There are a couple of options here we could use 6 and -1 or 2 and 3. 6 and -1 would not work because both signs in the equation are plus which means we need our factors to both be positive, also if you tried 6 and -1 and then foiled out the factors to check it, it would not work. So 2 and 3 have to be the factors so the equations equals (x+2)(x+3)=0. Now we set each factor equal to zero and solve for x: (x+2)=0, x= -2 and (x+3)=0, x= -3. Those are the two numbers that would work! Hope this helps!!

5 0
3 years ago
Read 2 more answers
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