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malfutka [58]
3 years ago
11

How do you solve this

Mathematics
2 answers:
jeyben [28]3 years ago
7 0
7x-9=-4x+90
You need to put x in one side.
So it will be 7x+4x=90+9
11x=99 now divide 11 on both sides
11x/11 = 99/11
So final answer is x=9
Alex_Xolod [135]3 years ago
7 0

7x - 9 = -4x + 90

11x - 9 = 90

11x = 99

x = 9


You can check by substituting the 9 for the x value.

7(9) - 9 = -4(9) + 90

63 - 9 = -36 + 90

54 = 54



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3 years ago
Write an equation that represents the line?
yarga [219]

Answer:

An equation that represents the line is:

y = 3/4x - 9/2

Step-by-step explanation:

The slope-intercept form of the line equation

y = mx+b

where

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  • b is the y-intercept

Given the attached graph of a line.

Taking two points from the line, such as

  • (2, -3)
  • (6, 0)

Determining the slope between (2, -3) and (0, 6)

\left(x_1,\:y_1\right)=\left(2,\:-3\right),\:\left(x_2,\:y_2\right)=\left(6,\:0\right)

m=\frac{0-\left(-3\right)}{6-2}

refine

m=\frac{3}{4}

substituting m = 3/4 and the point (2, -3) in the slope-intercept form of the line equation

y = mx + b

\left(-3\right)=\frac{3}{4}\left(2\right)+b

\frac{3}{2}+b=-3

subtract 3/2 from both sides

\frac{3}{2}+b-\frac{3}{2}=-3-\frac{3}{2}

b=-\frac{9}{2}

now substituting b = -9/2 and m = 3/4 in the slope-intercept form of the line equation

y = mx + b

y = 3/4x + (-9/2)

Therefore, an equation that represents the line is:

y = 3/4x - 9/2

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