Question

Please help.solve the system. 5x + 3y = 30 3x + 3y = 18

a.(6, -6)
b.(0, -6)
c.(-6, -6)
d.(6, 0)

Answer 1

let x=(9+n)/3
let y=(9-n)/3

plug in and solve for n

Answer 2

thank you

Answer 3

in the end, i believe (6,0) fits the best

Answer 4

wait plug in 3 or 9? and thank you

Answer 5

5x + 3y = 30
3x + 3y = 18

let x=(9+n)/3
let y=(9-n)/3

1: 5(9+n)/3 + 3(9-n)/3 = 30
2: 3(9+n)/3 + 3(9-n)/3 = 18

why did i pick those substitutions?

2: 9+n+ 9-n = 18, regardless of what n is

so lets determine it from the other equation

1: 5(9+n)/3 + 3(9-n)/3 = 30
5(9+n) + 3(9-n) = 90
45 +5n + 27 -3n = 90
2n + 27 = 45
2n = 18
n = 9

x=(9+n)/3
=(9+9)/3
=18/3
=6

y=(9-n)/3
=(9-9)/3
=0/3
=0

Answer 6

alright htank you so much

Answer 7

youre welcome

Answer 8

@amistre64 can you help me with this problem ,

Solve the following system by graphing and identify the point of intersection.

-5x + 2y = -4

2x - y = 2


a.(–2, 0)
b.(1, 2)
c.(2, 1)
d.(0, –2)