Answer:
The answer to your question is x = -0.6, y = 0 or (-0.6, 0)
Step-by-step explanation:
Equations
-2x + 3y = 1.2 ------------------ (I)
-3x - 6y = 1.8 ------------------ (II)
Solve equation I for y
3y = 2x + 1.2
y = 2/3x + 1.2/3
Substitute in equation II
-3x - 6(2/3x + 1.2/3) = 1.8
Simplification
-3x - 4x - 2.4 = 1.8
Solve for x
-7x = 1.8 + 2.4
-7x = 4.2
x = 4.2/-7
x = - 0.6
Find the value of y
y = 2/3 (-0.6) + 1.2/3
y = -0.4 + 0.4
y = 0
Amber plus 2 family members = 3 total people on the plan.
They share the minutes equally so divide the minutes by 3 to find how many she can use:
720 / 3 = 240 minutes per month.
Now divide the monthly minutes by 30 days:
240 / 30 = 8 minutes per day.
Answer:
24
Step-by-step explanation:
Step 1: We make the assumption that 120 is 100% since it is our output value.
Step 2: We next represent the value we seek with $x$.
Step 3: From step 1, it follows that $100\%=120$.
Step 4: In the same vein, $x\%=28.8$.
Step 5: This gives us a pair of simple equations:
$100\%=120(1)$.
$x\%=28.8(2)$.
Step 6: By simply dividing equation 1 by equation 2 and taking note of the fact that both the LHS
(left hand side) of both equations have the same unit (%); we have
$\frac{100\%}{x\%}=\frac{120}{28.8}$