Question

Por favor calcular os sistemas

A) 2x+y=3
3x- y=7

B) 3x+2y=24
x + y=10

C) 3x+4y=15
5x-3y=-4

D) 2p+11q=5
7p+ 3q=-24

Answer 1

2x+y=3
3x- y=7

5x = 10
x=2
3*2-y=7
6 - y= 7
-y = 1
y=-1

B) 3x+2y=24
x + y=10 ( -2 ) ==> -2x - 2y = -20
x = 4
4 + y=10 ==> y = 6