Question

a) x+y=10
x-y=4

b) 2x+y=19
x=2+y​

Answer 1

a) x+y=10

x-y=4

x=4+y

4+y+y=10

2y=10-4

2y=6

y=6÷2

y=3

x=4+3

x=7

7+3=10

b) 2x+y=19

x=2+y

2(2+y)+y=19

4+2y+y=19

4+3y=19

3y=19-4

3y=15

y=15÷3

y=5

x=2+5=7

2×7+5

14+5=19

espero ter ajudado :)