Which of the following is NOT a solution to the equation 4x - 4y = -21?
(1,-5)
(0,-21/5)
(1,5)
(-2,-13/5)
Answers
Step-by-step explanation:
It is given
5x−4y=20
Now by substituting (4,0) in the place of x and y We know that the LHS
=5x−4y
=5(4)−4(0)
On further calculation
=20
=RHS
Therefore (4,0) is the solution of 5x−4y=20
(ii) It is given
5x−4y=20
Now by substituting (0,5) in the place of x and y We know that the LHS
=5x−4y
=5(0)−4(5)
On further calculation
=−20
=RHS
Therefore (−2,
2
5
) in the place of x and y we know that the LHS
=5x−4y
=5(−2)−4(
2
5
)
On further calculation
=−10−10
=−20
=RHS
Therefore (−2,
2
5
)is not the solution of 5x - 4y = 20
(iv) it is given
5x−4y=20
Now by substituting (0,5) in the place of x and y We know that the LHS
=5x−4y
=5(0)−4(−5)
Our further calculation
=20
=RHS
Therefore, (0,-5) is the solution of 5x−4y=20
(v) it is given
5x−4y=20
Now by substituting (2,−
2
5
) in the place of x and y we know that the LHS
=5x−4y
=5(2)-4 (−
2
5
)
On further calculation
=10+10
=20
=RHS
Answer:
one of three angles are exactly what you want to