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4a + 1v =57
-2a +1v= 9
I will multiply the second by -1 to cancel v variable (elimination method)
4a +1v =57
2a -1v = - 9
add both
6a. = 48
a= 8
4a= 32
32 + v = 57
v= 25
32+25 = 57
-16 +25=9
9/20
explanation:
7/10 - 1/4
14/20 - 5/20
14-5/20
9/20
The answer is 275. hope it helps :)