Answer:
a. {(0, 7), (-1, 6)}
Step-by-step explanation:
subtract the equations
for 
, substitute x = 0
for , substitute x = 0
1-3=-2 so -2/8 is -1/4 so negative one fourth
Answer: 2
Step-by-step explanation:
2
Answer:
25%
Step-by-step explanation:
20 / 5 = 4
100 ÷ 4 = 25
= 25%
HOPE THIS HELPS
PLZZ MARK BRAINLIEST
Answer:
10 and 15
Step-by-step explanation:
Let 'x' and 'y' are the numbers we need to find.
x + y = 25 (two numbers whose sum is 25)
(1/x) + (1/y) = 1/6 (the sum of whose reciprocals is 1/6)
The solutions of the this system of equations are the numbers we need to find.
x = 25 - y
1/(25 - y) + 1/y = 1/6 multiply both sides by 6(25-y)y
6y + 6(25-y) = (25-y)y
6y + 150 - 6y = 25y - (y^2)
y^2 - 25y + 150 = 0 quadratic equation has 2 solutions
y1 = 15
y2 = 10
Thus we have
:
First solution: for y = 15, x = 25 - 15 = 10
Second solution: for y = 10, x = 25 - 10 = 15
The first and the second solution are in fact the same one solution we are looking for: the two numbers are 10 and 15 (since the combination 10 and 15 is the same as 15 and 10).
