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Dafna1 [17]
3 years ago
5

X+y=7 x-y=3 2x-3y=15 3x-2y=10

Mathematics
1 answer:
IgorLugansk [536]3 years ago
6 0

Step-by-step explanation:

x+y=7 _ eqn1

x-y=3_ eqn2

add eqn1 and eqn2

x+y=7

+ x-y=3

= 2x= 10

x=5

x+y=7

5+y=7

y=7-5

y=2 proved

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Step-by-step explanation:

d) (-2 +4i) -( 3 + 9i) = -2 + 4i - 3 - 9i

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