contestada

PLZ HELP!!
Solve the following system of equations. Express your answer as an ordered pair in the format (a,b), with no spaces between the numbers or symbols. 3x+4y=17, -4x-3y=-18

Respuesta :

nicolina
3x+4y=17, -4x-3y=-18
Multiply 1st system by 4 and the 2nd by 3:
12x+16y=68 , -12x-9y=-54
Rule of elimination:
12x+16y=68 , 7y=14
12x+16y=68 , y=14/7
12x+16y=68 , y=2
12x=68-32 , y=2
12x=36 , y=2
x=3 , y=2

Otras preguntas