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gogolik [260]
3 years ago
7

How do I solve system of equations substitution method??!!?!???

Mathematics
1 answer:
adelina 88 [10]3 years ago
8 0
For example:

x+2y=7
6x+7y=2
__________

x=7-2y *
6*(7-2y)+7y=2 **

__________

x=7-2y
42-12y+7y=2
__________

x=7-2y
-5y=-40
__________

x=7-2y
y=8

x=-9
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(b) Factorise fully 2 a²b + 6ab2
den301095 [7]

Answer:

<h2>2ab(a+3b)</h2>

Step-by-step explanation:

2 {a}^{2} b + 6a {b}^{2}

Factor out common term : 2ab

2 {a}^{2}b \div 2a = a \\ 6a {b}^{2}  \div 2ab = 3b  \\ 2ab(a + 3b)

6 0
3 years ago
Read 2 more answers
Which set is a function?
Sonja [21]
B, short explanation remember the sets are set up like (x,y) in a set there should be no matching x points so if it matches it's not a function :)

long explanation: these are (x,y) sets {(0,3), (3,0), (0,4), (4,0)} the first choice shows that there are two X solutions <span>if they are equal to 0 (0,3) (0,4) so this cant be a function.

second choice</span><span> {(0,2), (2,0), (4,6), (6,4)} does not have two X solutions so this is a function
third choice</span>{(2,6), (3,6), (4,6), (2,0)} has two X solutions if x is equal to 2
and the last choice <span>{(6,2), (2,0), (4,6), (6,4)} has two X solutions if x is equal to 6
hope i helped! if i did please give me brainlest :)
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8 0
3 years ago
What is the difference when the sum of 15 and 10 is subtracted from the product of 15 and 10.
Eva8 [605]

Answer:

125

Step-by-step explanation:

15+10=25

15x10=150

150-25=125

6 0
3 years ago
Read 2 more answers
What is the answer to the equation 7/9+1/7+3/5
Eva8 [605]

Answer:

Step-by-step explanation:

1.52063492063

3 0
4 years ago
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The measures of three angles of a triangle are given by (8x - 5), (2x)º, and (3x – 10). What is the measure of the largest angle
zhannawk [14.2K]

Answer: 115°

Step-by-step explanation:

We should note that the sum of the angles that are in a triangle is equal to 180°, therefore we will add the angles given and equate them to 180°. This will be:

(8x - 5) + (2x) + (3x - 10) = 180

8x - 5 + 2x + 3x - 10 = 180

Collect like terms

8x + 2x + 3x = 180 + 5 + 10

13x = 195

x = 195/13

x = 15

The angles are:

8x - 5 = 8(15) - 5 = 120 - 5 = 115°

2x = 2(15) = 30°

3x - 10 = 3(15) - 10 = 45 - 10 = 35°

Therefore, the largest angle is 115°

3 0
3 years ago
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