Solve the equation by graphing -3x+1=-8

Treat this problem as one involving finding the point at which two lines intersect.  

One line would be y = -3x + 1; the other would be the horiz. line y = -8.

Whenever two lines intersect, the coefficients of the point of intersection satisfy both equations.  Thus, we set y = y, or, in this case, -3x + 1 = -8.

Subtracting 1 from both sides, we get -3x + 1 - 1 = -8 - 1, or

-3x = -9, or (after dividing both lines by -3)  x = 3.

We already know that the y-coordinate of the point of intersection / solution is y = -8, so we can write the solution as

(3, -8)

First, draw the horizontal line y = -8.

Next, draw the line y = -3x + 1.  Letting x = 0, we get y = 1, which means that the y-intercept is (0,1).  Place a black dot at (0,1).  Now, taking info from the slope (-3), find and place a black dot at the next point, as follows:

From your dot at (0,1), move 1 unit to the right and then 3 units down.  This point will be (1,-3).  Place a black dot there.

Draw a line through your two black dots.  You'll see that this line and the line y = -8 intersect at (3,-8).

expression #3 is not equivalent. the others are.

9) i can't see the angle so whatever it is just do this: cos(angle) x hypotenuse and then use that answer and they hypotenuse and plug it into this: (answer you just got)^2 + b^2 = (hypotenuse)^2. the first answer will be the answer of the adjacent side and the second answer after this equation will be the opposite side.

10) y = 14 x = √147 or 12.12435565

11) x = 4.8

12) x = 4.2

13) x = 9.3

14) pq: 13.2

qr : 17.6

angle p: 53º

15) angle c: 54.3º

angle a: 35.7º

16) h = 21040

v = 1841

step-by-step explanation:

10) 7/sin(30) = 14 = y

7^2 + b^2 = 14^2

49 + b^2 = 196

b^2 = 196 - 49

√b^2 = √147

x = √147

11) cos(70) x 14 = 4.788282007

x = 4.8

12) tan(25) x 9 = 4.196768923

x = 4.2

13) sin(31) x 18 = 9.270685348

x = 9.3

14) pq: sin(37) x 22 = 13.23993051

pq: 13.2

qr: cos(37) x 22 = 17.56998122

qr : 17.6

angle p: 180 - (37 + 90) = 53º

15) cos-1(7/12) = 54.31466529

angle c: 54.3º

angle a: 180 - (90 + 54.31466529) = 35.68533471

angle a: 35.7º

16) 4 x 5280 = 21120

cos(5) x 21120

h = 21039.63202

h = 21040

sin(5) x 21120

v = 1840.729287

v = 1841