You'll have to solve simultaneously
let nickel be x, dime be y
x + y = 35 ... ( 1 )
5x + 10 y = 250
5 ( x + 2y ) = 250
x + 2y = 50 ... ( 2 )
in ( 1 )
x = 35 - y ( 3 )
sub ( 3 ) into ( 2 )
( 35 - y ) + 2y = 50
y = 15
sub y into ( 1 )
x + y = 35
x + 15 = 35
x = 20
therefore, Sandy has 20 nickels and 15 dimes
Answer: $738
Step-by-step explanation:
<em>Find the perimeter:</em>
15 + 15 + 26 + 26 = 30 + 52 = 82 yards.
<em>Since it's $9 per yard, multiply:</em>
82 · $9 = $738
They flowed 15 miles UP.
This is equivalent to a positive 15.
Then 9 miles DOWN.
This is equivalent to a negative 9.
Now put these two numbers together.
15-9
So, c. 15-9=6
Slope-intercept form:
y = mx + b
"m" is the slope, "b" is the y-intercept (the y value when x = 0) or (0,y)
To find "m", you can use the slope formula and plug in the two points:
(2,3) = (x₁ , y₁)
(0,9) = (x₂ , y₂)
m = -3
y = -3x + b
To find "b", you can plug in one of the points into the equation (however they already gave you the y-intercept (0,9) or 9)
(2,3)
y = -3x + b
3 = -3(2) + b
3 = -6 + b
9 = b
y = -3x + 9
