For the following system, if you isolated x in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

-x + 2y = -6
3x + y = 8

Question

For the following system, if you isolated x in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

-x + 2y = -6
3x + y = 8

rishavraj · Answer

from first equation 
x = 6 + 2y

rishavraj · Answer

on plugging the value of x in second equation
$$3(6 + 2y) + y = 8 $$

anonymous · Answer

i forgot to put answers here they are
 -2y + 6
 2y - 6
 2y + 6
 -2y - 6

owlcoffee · Answer

All you have to do, is take the expression that Rish wrote above and simplify it as much as you can.

anonymous · Answer

is that JB in your picture and im not good at simplifying equations like this lolol

owlcoffee · Answer

No, that's my own photo...
And I think Rish already gave you the answer.

anonymous · Answer

2y+6?

rishavraj · Answer

@TheAlgebraHelper  man i wrote the answer in my very first comment.....:)

anonymous · Answer

so it is 2y+6 LOL

anonymous · Answer

@rishavraj help me with one more?

rishavraj · Answer

okay....

anonymous · Answer

An equation is shown below:

3 over 2 multiplied by x plus 7 over 2 equals 2 to the power of x

What is the solution to the equation?

anonymous · Answer

x = 1
 x = 3
 x = 5
 x = 8

rishavraj · Answer

u mean 
$$\frac{ 3 }{ \frac{ 2x + 7 }{ 2 } } = 2^{x}$$

anonymous · Answer

umm no

anonymous · Answer

$$3\over2$$ x +$$7\over2$$ = 2^x

rishavraj · Answer

okay then x = 3......

anonymous · Answer

lol thnx