Question

Plz help!! :
A system of equations is shown below:

2x = 5y + 4
3x - 2y = -16

What is the solution to this system of equations?

Answer 1

A. (-8, -4)
B. (8, 4)
C. (-4, -8)
D. (4, 8)

Answer 2

you just plug in x and y from your choices and see which one works.

Answer 3

if you didn't have the choices, then make the equations look the same and get rid of a variable.

Answer 4

2x = 5y + 4
2x - 5y = 4

now we have :
2x - 5y = 4 ---->(3)
3x - 2y = -16 --->(-2)
-------------
6x - 15y = 12 (result of multiplying by 3)
-6x + 4y = 32 (result of multiplying by -2)
------------- add
-11y = 44
y = - 4

2x = 5y + 4
2x = 5(-4) + 4
2x = -20 + 4
2x = -16
x = -8

solution is : (-8,-4)

Answer 5

do you have any questions at all ?

Answer 6

no thx :)