Solve the following system of equations.

2x + y = 3

x = 2y - 1
@hartnn

Question

Solve the following system of equations.

2x + y = 3

x = 2y - 1 
@hartnn

anonymous · Answer

Just plug in the second expression into the x value of the first expression so you will get $$2(2y-1) + y = 3$$ then solve for y, plug in that value into either equation and solve for x.

jim_thompson5910 · Answer

Hint

2x + y = 3

2(2y-1) + y = 3 ... plug in x = 2y - 1

4y - 2 + y = 3

5y - 2 = 3

I'll let you finish up

anonymous · Answer

y=1

jim_thompson5910 · Answer

now use that to find x

anonymous · Answer

x=1

jim_thompson5910 · Answer

you got it

anonymous · Answer

For the following system, use the second equation to make a substitution for y in the first equation.

2x + y = 6

y = 3x + 4

What is the resulting equation?


y+ 2x+y= 6
2x+y+ 3x+ 4 = 6
2x+ (3x+ 4) = 6

jim_thompson5910 · Answer

which one do you think it is?

use the last problem as a guide

anonymous · Answer

x=-3

anonymous · Answer

y=16

jim_thompson5910 · Answer

but what is the answer to the initial question

anonymous · Answer

For the following system, use the second equation to make a substitution for y in the first equation.

3x + y = 1

y + 4 = 5x

What is the resulting equation?

jim_thompson5910 · Answer

you need to solve for y in the second equation first

anonymous · Answer

Based on the lesson, which of the following would be the best approach for solving this system by substitution?

5x = y + 6

2x - 3y = 4


Solve the first equation forx.
Solve the first equation fory.
Solve the second equation forx.
Solve the second equation fory.

jim_thompson5910 · Answer

which one do you think it is