3a/7 = -2/5
explanation would be helpful.
thanks
2007-07-13 15:07:24 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
crossmultiply
so multiply both sides by 7 - and then you multiply both sides by 5
7(3a/7) = -14/5
3a = -14/5
15a = -14
a = -14/15
and then to check, you put the value of a back into the original equation.
3x (-14/15) / 7
and see if it equals -0.4
2007-07-13 15:10:11 · answer #1 · answered by Orinoco 7 · 0⤊ 0⤋
Move 3/7 to the other side by multiplying both sides by 7/3, the reciprocal of 3/7,
a = (-2/5)(7/3) = -14/15
2007-07-13 22:16:59 · answer #2 · answered by sahsjing 7 · 0⤊ 0⤋
3a/7 = -2/5
3a = -2/5 *7
3a = -14/5
a = -14/15
u can check by substituting a= -14/15in 3a/7 = -2/5
[3(-14/15)] /7 = -2/5
(-14/5) /7 = -2/5
-2/5 = -2/5
LHS=RHS
Hence proved
2007-07-14 01:43:52 · answer #3 · answered by sweet n simple 5 · 0⤊ 0⤋