Resolva o sistema abaixo a) 3x + y=8 x + 3y=6

3x + y = 8 x + 3y = 6

Solve for y in the first equation.

Subtract 3x from both sides. y = 8 - 3x Plug y into the second equation.

x + 3 (8 - 3x) = 6

Distribute 3 inside the parentheses. x + 24 - 9x = 6 Combine like terms. - 8x + 24 = 6 Subtract 24 from both sides. - 8x = - 18 Divide both sides by - 8. x = 18/8 = 9/4 Plug x into the first equation.

3 (9/4) + y = 8

Multiply 3 and 9/4. 6.75 + y = 8 Subtract 6.75 from both sides. y = 1.25 = 5/4

Your answers are:

x = 9/4 or 2.25 y = 5/4 or 1.25