Quadratic formula = (-b +- sqrt(b^2 - (4ac))) / 2a
and
then simplify and solve
Y = -2x - 1
y = 3 - x - 1......y = 2 - x
2 - x = -2x - 1
-x + 2x = -1 + 2
x = 1 <==
Answer:
x=
1/2
and y=3
Step-by-step explanation:
Let's solve your system by substitution.
y=10x−2;2x+y=4
Step: Solvey=10x−2for y:
y=10x−2
Step: Substitute10x−2foryin2x+y=4:
2x+y=4
2x+10x−2=4
12x−2=4(Simplify both sides of the equation)
12x−2+2=4+2(Add 2 to both sides)
12x=6
12x
12
=
6
12
(Divide both sides by 12)
x=
1
2
Step: Substitute
1
2
forxiny=10x−2:
y=10x−2
y=10(
1
2
)−2
y=3(Simplify both sides of the equation)
Answer:
x=
1
/2
and y
40% of 60 is 24
To convert from percent to decimal, divide the percent without the percent symbol by 100.
so, 40% = 40/100 = 0.4
40% 60 is just 0.4*60 = 24
