Three apples and four bananas cost $4.85. Three apples and ten bananas cost 8.75. Find the cost of an apple.

Answer $0.75

Step-by-step explanation:

3a + 4b = 4.85

3a + 10b = 8.75

Both equations have 3a therefore we can isolate 3a in each equation.

Now:

3a = 4.85 - 4b and 3a = 8.75 - 10b

If 3a each equal different values we now set those values equal and solve for b.

4.85 - 4b = 8.75 - 10b

6b = 3.90

6b/6 = 3.90/6

b = 0.65

Now substitute this into the first equation to solve for a.

3a = 4.85 - 4b

3a = 4.85 - 4(0.65)

3a = 4.85 - 2.60

3a = 2.25

3a/3 = 2.25/3

a = 0.75

which expression can be used to convert 80 us dollars (usd) to australian dollars (aud)?

1 usd = 1.0343 aud

1 aud = 0.9668 usd

step-by-step explanation:

sorry just need the points