Question

Does someone mind helping me with this problem? Thank you!

Answer 1

x = 71

y = 19

Explanation:

I solved by graphing and got (71,19) as included in the image. A more mathematical way to solve is by substitution. You try to find x with one of the equations, plug in x and then solve for y.

x + y = 90

x = 90 - y

90 - y = 14 + 3y

90 - y + y= 14 + 3y + y

90 = 14 + 4y

90 - 14= 14 + 4y - 14

76= 4y

19 = y

x + y = 90

x + (19) = 90

x + 19 - 19= 90- 19

x = 71

Answer 2

x=71; y=19

Explanation:

x+y = 90 so x =90-y = 14+3y

so 90=14+4y

90-14 = 4y

76=4y

y=19

x=71