Question

resolva os sistemas de equações do 1 grau:
2x+3x=8
5x-2y=1


x-y=2(x-y)-2
4x-3y=7

Answer 1

5x=8. 5(8/5)-2y=1
x=8/5. 40/5-2y=1
8-1=2y
7=2y
y=7/2


x-y=2x-2y-2. 4(-2+3y)-3y=7
x-y-2x-2y=-2. -8+12y-3y=7
x-3y=-2. 9y=7+8
x=-2+3y. 9y=15
x=-2+3(5/3).
x=-2-15/9
x=2-1/3
x=6/3-1/3=2/3. y=15/9. y=5/3