+0

0
110
3

All triangles have the same value, and all circles have the same value. What is the sum of two circles?

\begin{align*} \Delta + \bigcirc + \Delta + \bigcirc + \Delta + \bigcirc + \Delta + \Delta&= 21\\ \bigcirc + \Delta+\bigcirc+\Delta+\bigcirc + \Delta + \bigcirc + \bigcirc &= 16\\ \bigcirc + \bigcirc &= \ \, ? \end{align*}

Feb 11, 2021

#1
+1

5t + 3c = 21     Or  multiply by -3  to get

-15t -9c = -63

3t + 5c = 16          Multiply by 5 to get
15 t + 25c = 80         Add eq 2 an 4 to get

16c = 17         Divide by 8

2c = 17/8

Feb 11, 2021
#2
+120129
+1

Let  the triangles  = x

Let  the circles  = y

So  we  have

5x + 3y   =  21   mult through by -3  ⇒  -15 x  -  9y   =  -63

3x +  5y  =  16    mult through by 5  ⇒   15x   +  25y  =  80      add these

-16y  =  -17

y  =  -17/-16 = 17/16

So

2y  =    34 / 16   =  17 / 8

Feb 11, 2021
#3
+8
-1

Thanks so much!

It was right, but i tped it in wrong... so i got it wrong. But thanks!

AydenFilmoreismybro  Feb 11, 2021