V=Van
B=Bus
Solve the following system:
{6 B + V = 372 | (equation 1)
12 B + 4 V = 780 | (equation 2)
Swap equation 1 with equation 2:
{4 V + 12 B = 780 | (equation 1)
V + 6 B = 372 | (equation 2)
Subtract 1/4 × (equation 1) from equation 2:
{4 V + 12 B = 780 | (equation 1)
0 V+3 B = 177 | (equation 2)
Divide equation 1 by 4:
{V + 3 B = 195 | (equation 1)
0 V+3 B = 177 | (equation 2)
Divide equation 2 by 3:
{V + 3 B = 195 | (equation 1)
0 V+B = 59 | (equation 2)
Subtract 3 × (equation 2) from equation 1:
{V+0 B = 18 | (equation 1)
0 V+B = 59 | (equation 2)
Collect results:
V = 18 - Number of students in each Van
B = 59 - Number of students in each Bus.
x + y = 6
4x + 3.50y = 22, solve for x, y
Solve the following system:
{x + y = 6
4 x + 3.5 y = 22
In the first equation, look to solve for y:
{x + y = 6
4 x + 3.5 y = 22
Subtract x from both sides:
{y = 6 - x
4 x + 3.5 y = 22
Substitute y = 6 - x into the second equation:
{y = 6 - x
3.5 (6 - x) + 4 x = 22
3.5 (6 - x) + 4 x = 4 x + (21. - 3.5 x) = 0.5 x + 21.:
{y = 6 - x
0.5 x + 21. = 22
In the second equation, look to solve for x:
{y = 6 - x
0.5 x + 21. = 22
0.5 x + 21. = x/2 + 21:
x/2 + 21 = 22
Subtract 21 from both sides:
{y = 6 - x
x/2 = 1
x = 2 - Pounds of nuts
y = 4 - Pounds of dried fruit