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subtract the 2 equations, what u get ?

I am sorry don't understand

b=5/4?

very close,but its
7b-2b = 7-(-3)
can you proceed ?

9b=4

7-2 = 5
7- (-3) = 7+3 =10
-_-

so b=5/10?

7b-2b = 7-(-3)
5b = 10
b=10/5 = 2
got this ?

still confused

on which step ?

7-(-3) since it has a minus sign in front i believed it was to be subtracted not added.

- * - = +
so, 7 - (-3) became 7+3

ok now i understand

so the final answer would be 2

b=2
you still need to find 'a'
put b=2 in any 1 of the original equation to get a