+0  
 
0
184
11
avatar+2442 

Please help asap, ty!

 Apr 24, 2018
 #1
avatar+972 
+2

64. 

 

You tangent for 64.

 

sin 28 = 26 / YX

 

sin 28 is about 0.27

 

0.27 = 26/YX

 

you can solve for YX

 Apr 24, 2018
 #2
avatar+2442 
0

What..? I dont understand..

RainbowPanda  Apr 24, 2018
 #4
avatar+972 
+3

What do you not understand.

GYanggg  Apr 24, 2018
 #5
avatar+2442 
0

I don't understand how to get YX from that

RainbowPanda  Apr 24, 2018
 #6
avatar+972 
+3

It is an equation, 0.27 =  26/YX

 

you multiply both sides by YX

 

0.27 * YX = 26

 

YX is about 96.

GYanggg  Apr 24, 2018
 #7
avatar+972 
+3

I hope this helped.

GYanggg  Apr 24, 2018
 #8
avatar+2442 
0

But that's incorrect...YX is 55.4 mm and YZ is 48.9 mm

I just need to figure out how to get those answers

RainbowPanda  Apr 24, 2018
 #3
avatar+972 
+3

To solve YZ, you use tangent. 

 

Tangent is opposite over adjacent.

 

Tan 28 = 26/ YZ

 

you can solve for YZ

 Apr 24, 2018
 #9
avatar
+2

Sin(28) = 26 / YX

 

0.46947... = 26 / YX     cross multiply

0.46947*YX = 26          divide both sides by 0.46947

YX = 26 / 0.46947

YX =~55.4 mm

 

Tan(28) = 26 / YZ

0.531709 = 26 / YZ          Cross multiply

0.531709*YZ = 26            Divide both sides by 0.531709

YZ = 26 / 0.531709

YZ =~48.9 mm

 Apr 24, 2018
 #10
avatar+2442 
+1

Tysm! :D

RainbowPanda  Apr 24, 2018
 #11
avatar
+1

63)

 

(x + 2)^2 + y^2 =25.......................(1)

-x + y = 1.......................................(2)

 

y =1 + x sub this into (1)

(x + 2)^2 + (1 + x)^2 = 25, solve for x

 

(x + 1)^2 + (x + 2)^2 = 25

 

Expand out terms of the left hand side:

2 x^2 + 6 x + 5 = 25

 

Divide both sides by 2:

x^2 + 3 x + 5/2 = 25/2

 

Subtract 5/2 from both sides:

x^2 + 3 x = 10

 

Add 9/4 to both sides:

x^2 + 3 x + 9/4 = 49/4

 

Write the left hand side as a square:

(x + 3/2)^2 = 49/4

 

Take the square root of both sides:

x + 3/2 = 7/2 or x + 3/2 = -7/2

 

Subtract 3/2 from both sides:

x = 2 or x + 3/2 = -7/2

 

Subtract 3/2 from both sides:

 

x = 2   and   y = 3                     or     x = -5   and   y = - 4

 Apr 24, 2018

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