filou222 filou222
  • 23-11-2014
  • Mathematics
contestada

Substitution methode:
y=2x-5
4x-y=7

I thought you do it like this:
4x-2x-5=7
2x-5=7
2x=12
x=6
But that's not right.. What did I do wrong?

Respuesta :

konrad509
konrad509 konrad509
  • 23-11-2014
It should be 4x-(2x-5)=7.

[tex]4x-(2x-5)=7\\ 4x-2x+5=7\\ 2x=2\\ x=1[/tex]
Answer Link

Otras preguntas

What are the components needed in order for an experiment to be valid? Identify these components in the following experiment: A scientist is testing a new plant
Jenny has 50 square tiles. She arranges the tiles into a rectangular army of 4 rows. How many tiles are leftover?
Do 3/7 and 7/3 represent the same length on a number line? Explain
A friend talks to you as she walks past you at a speed of 2.25 m/s. why do you not notice a Doppler shift in her voice as she passes?
Byron and Kate's dinner cost $18.23. about how much money should they leave for a 15% tip?
The chemical formula for water, H2O, means that each water molecule contains
What latitude was chosen as the dividing line between slave and free states?
heterotrophic bacteria create their own food ?
Film studios make a commission from every ticket sold.thr movie ticket at carbob theaters cost $8.50.the stidio earn a 40% commission.what amount of the movie t
What fluid flows very slowly?