3y + n = 250
y + n = 150
Equation 1 is in the correct format.
Equation 2 is in the correct format.
y + n = 150
y + n - n = 150 - n
y = 150 - n
3(y) + n = 250
3 * (150 - n) + n = 250
450 - 3n + n = 250
-3n + n = 250 - 450
-2n = -200
-2n | |
-2 |
= |
-200 |
-2 |
n = | -200 |
-2 |
n = 100
3y + 1(100) = 250
3y + 100 = 250
3y = 250 - 100
3y = 150
3y | |
3 |
= |
150 |
3 |
y = | 150 |
3 |
y = 50