40 POINTS TO WHO EVER answers first Which system of equations is equivalent to the following system?

4x + y = 4
2x + 7y = 28

A. 4x + y = 4
−2x − 7y = 28

B. 4x + y = 4
−8x − 28y = 112

C.−28x − 7y = −28
2x + 7y = 28

D. −8x − 2y = 8
2x + 7y = 28

A

Step-by-step explanation:

Given :

2x + 4y = 14   eq 1

4x + y = 20 eq 2

if you multiply eq 2 by -4 on both sides, you get

-4 (4x + y = 20) = -4 (20)

-16x -4y = -80 eq3

we can see that eq. 1 and eq 2 together forms the system of equations presented in option A, Hence A is equvalent to the orginal system of equations given in the question.

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

rx and sx

step-by-step explanation: