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inn [45]
3 years ago
11

What is the x-value that solves the system 4x-y=21 and y=3x-7

Mathematics
2 answers:
netineya [11]3 years ago
5 0

Answer:   x=14 is right answer

<em><u>4x-y=21 =</u></em>

Slope = 4

x-intercept = 21/4 = 5.25000

 y-intercept = 21/-1 = -21.00000

<em><u> y=3x-7 = </u></em>

 Slope = 6.000/2.000 = 3.000

 x-intercept = 7/3 = 2.33333

 y-intercept = -7/1 = -7.00000

Step-by-step explanation:

Step  1  :

Equation of a Straight Line

Graph of a Straight Line

Calculate the Y-Intercept

Calculate the X-Intercept

Calculate the Slope

<em><u>Hope this helps.</u></em>

natali 33 [55]3 years ago
4 0

Answer:

x=14

Step-by-step explanation:

4x-y=21

y=3x-7

Substitute the second equation in for y in the first

4x - (3x-7) = 21

Distribute the minus sign

4x -3x +7 = 21

x +7 = 21

Subtract 7 from each side

x+7-7=21-7

x=14

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