Question

Y = 20x + 40 y = 30x + 10
x= ?
y= ?

Answer 1

X = 3

Y = 100

Explanation:

The best way to solve equations like this is to plug & chug.

First, choose an equation and replace the Y variables with the y=... equation

Y = 30x + 10

(20x + 40) = 30x + 10

Then isolate the variable by subtracting 10 and 20x from both sides

40 - 10 = 30x - 20x

30 = 10x Divide by 10

3 = x

Y is much simpler; Plug x = 3 into one or both equations, plugging it into both will check your answer.

y = 20(3)+40

y = 60 + 40

y = 100

To double check math plug both variables into the other equation.

100 = 30(3) + 1=

100 = 90 +10

100 = 100