9514 1404 393
Answer:
- 3 ounces of 75%
- 7 ounces of 45%
Step-by-step explanation:
Let x represent the number of ounces of 75% silver needed. Then (10-x) is the number of ounces of 45% silver. The total silver required is ...
0.75x +0.45(10 -x) = 0.54(10)
0.30x +4.5 = 5.4
0.30x = 0.9
x = 0.9/0.3 = 3 . . . . . ounces of 75% silver
10-x = 7 . . . . . ounces of 45% silver
Luis needs 7 ounces of 45% silver and 3 ounces of 75% silver.
Answer:
y = 234t
Step-by-step explanation:
Divide the equation by t on both sides. See image.
Answer:
and 
Step-by-step explanation:
the perimeter of a rectangle is given by the following equation:

if a rectangle has a perimeter of 76cm and its length is 5 plus the double of its width we can use a system of equations to find the length
, and the width
.
For the perimeter of the rectangle
where
is its length, and
is its width, 76 is the perimeter of the rectangle in cm.
We know that the lengh of the rectangle is 5 plus the double of its width, writing the equation:

Substituting the equation above in 

We got that the rectangle width is w=11cm
Substituting w in the equation 

We got that the rectangle length is l=27cm
Verifying the values obtained
with l=27 and w=11
Satisfying the equation
Answer:
y =
x + 7
Step-by-step explanation:
the equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y-intercept )
here m =
, hence
y =
x + c ← is the partial equation
to find c substitute (4, 9) into the partial equation
9 = 2 + c ⇒ c = 9 - 2 = 7
y =
x + 7 ← equation in slope-intercept form