Question

solve the system of equations
4x+7y=47
5x-4y=-5

Answer 1

hint: multiply both sides of equation 1 by 4 and both sides of equation 2 by 7

after all this, add the equations

Answer 2

wait what ._.

Answer 3

4x+7y=47
5x-4y=-5


4*(4x+7y)=4*47
7*(5x-4y)=7*(-5)



16x+28y=188
35x-28y=-35

Answer 4

now add the two equations

16x+28y=188
35x-28y=-35
-------------
51x+0y = 153


51x = 153

x = ??

Answer 5

10.2.?

Answer 6

no

Answer 7

51x = 153

x = 153/51

x = 3

Answer 8

use that to find y

Answer 9

(5,3)

Answer 10

(3,5)