Step-by-step explanation:
x+y=5
3x-2y+5=0
3x-2y= -5
x+y=5...... equation 1
3x-2y= -5....... equation 2
there fore make x the subject of the formula in equation 1
x=5-y.. equation 3
substitute equation three in equation 2
3(5-y)-2y=-5
15y-3y-2y=-5
10y=-5
divide both sides by 10
y=-5/10
y=-½
substitute y into equation 1
x+(-½)=5
x=5+½
x=5½
x=5½,y= -½
Answer:
$480
Step-by-step explanation:
According to the problem, calculation of the given data are as follows,
Original cost including sales tax = $1,200
Discount = 60%
So, we can calculate the cost of TV after discount by using following formula:
Cost of TV after discount = $1,200 - ( $1,200 × 60%)
= $1,200 - $720
= $480
Hence, Cost of TV after discount is $480.
Answer:
Option 2, 3, 4
Step-by-step explanation:
It cannot be the 1st option because a linear function doesn't have an 
and adding an x to an x will not make it squared. ax + by = c is the linear equation.
It can be the 2nd option because the quadratic formula is f(x) = a + bx + c and the middle portion could cancel when adding 2 together.
It can be option 3, because f(x) = a + bx + c plus ax + by = c could give you the resulting function f(x) = -3 +5
It can be option 4 because multiplying ax + by = c by ax + by = c would give you an .
It cannot be option 5 because a + bx + c multiplied by a + bx + c would give you a function with 
A quarter is worth, 25 cents.
3 Nickels is worth 15 cents.
And 4, pennies is worth 4 cents.
The dollar bill is worth 1.00.
So, you combine the amount which gets you
1.44.
Morgan gave the clerk 1.44$.
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