Question 1154218: 1.3s+1.7f=37.9
5.4s+5.6f=147.2
can you send me the answers and the work if possible Found 2 solutions by MathLover1, MathTherapy:Answer by MathLover1(20849) (Show Source):
You can put this solution on YOUR website! ......eq.1 .....eq.2
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start with
......eq.1, solve for ........a)
substitute in eq.2
.....eq.2, solve for ≈
go to
........a), substitute ≈
Correct answers:
1.3s + 1.7f = 37.9 ------ eq (i)
5.4s + 5.6f = 147.2____2(2.7s + 2.8f) = 2(73.6)_____2.7s + 2.8f = 73.6 ----- eq (ii)
In order to avoid too many decimals and very large numbers, you can do the following:
1.4s + 1.1f = 35.7 ----- Subtracting eq (i) from eq (ii) ------ eq (iii)
.1s - .6f = - 2.2 ------ Subtracting eq (i) from eq (iii)------ eq (iv)
s - 6f = - 22_____s = 6f - 22 ---- Multiplying eq (iv) by 10 ---- eq (v)
1.3(6f - 22) + 1.7f = 37.9 ------- Substituting 6f - 22 for s in eq (i)
7.8f - 28.6 + 1.7f = 37.9
9.5f = 66.5
s = 6(7) - 22 ------ Substituting 7 for f in eq (v)
You can do the check!!
