marlisamoore
marlisamoore marlisamoore
  • 02-09-2017
  • Mathematics
contestada

can someone solve the system of equations?

can someone solve the system of equations class=

Respuesta :

APAgony
APAgony APAgony
  • 02-09-2017
y=x^2-5

y=2x-5
y+5=2x
x=(y+5)/2

y=((y+5)/2)^2-5
y=(y^2+10y+25)/4-5
4y=y^2+10y+25-20
0=y^2+6y+5
0=(y+5)(y+1)
y= -5 or -1

y=2x-5   (y= -5 doesn't work for this one so use -1)
-1=2x-5
2x=4
x=2

Using these answers, you can choose answer D with reasonable certainty.
Answer Link

Otras preguntas

The activity that causes changes in the behavior of costs is referred to as the activity ____________.
what are the missing numbers ?
I pleased anyone to help me please​
11. Alternativa incorrecta: a) La hada b) El agua c) El calor d) El pus e) El diploma
Set 2 Maths has 30 pupils in it. Set 1 Maths has 80% of the number of pupils in Set 2 How many pupils does Set 1 Maths have?
You invested 50% of the wealth in stock A and the remaining 50% in stock B. The expected rates of returns on A and B are given below: Year Expected r
Hemoglobin is a protein that binds to oxygen. It is only produced by red blood cells and it allows blood to transport oxygen throughout the body. which statem
Make a substitution to express the integrand as a rational function and then evaluate the integral. int_(25)^(81) sqrt(x)/(x-1) dx
Please answer this to the best of your ability
Para Rudolf Laban, existe um linguagem do movimento, que permite que ele seja registrado e interpretado. Explique como o método por ele desenvolvido divide o es