Question

If x+y=580 and x=3y then what are x and y?

Answer 1

Answer:

x=435 ,y=145

Step-by-step explanation:

You substitute x for 3y in this equation and get

3y+y=580

from here you simplify

4y=580

and divide 580 by 4 to get what y is

y=580/4

y=145

now since x=3y you mutiply y by 3

x=3(y)

x=3(145)

x=435

Answer 2

Answer:

x = 435

y = 145

Step-by-step explanation:

The key to this problem is that x = 3y. So put that into

x + y = 580                     Substitute 3y for x

3y + y = 580                   Combine like terms

4y = 580                         Divide by 4

4y / 4 = 580 / 4              Do the division

y = 145

x + y = 580                     Substitute the value for y

x + 145 = 580                 Subtract  145 from both sides

x = 580 - 145                  Combine

x = 435