So x + y = 45, and 4x + 5y = 195. Get y by itself. Subtract x from both sides in the first equation to get y = 45 -x, and subtract 4x from the second equation to get 5y = 195 - 4x. Divide by 5 to both sides to get y = 39 - 4/5x. 39 - 4/5x = 45 - x. Add x to both sides to get 39 - 1/5x = 45. Subtract 39 from both sides to get -1/5x = 6. Divide by -1/5 to get x = -30, or 30. In the first equation, do 30 + y = 45. Subtract 30 from both sides to get y = 15. Check. 4(30) + 15(5) = 195, or 120 + 75 = 195.

5 0

3 years ago

Witch 2 numbers are 4 units away from zero on a number line

Liula [17]

Answer:

it depends which way youre going, but 4 and -4 work.

Step-by-step explanation:

6 0

2 years ago

Ryan drove for 4.5 hours to his uncle’s house. His uncle lives 234 miles away. Assuming Ryan drove at a constant rate, at what s

Fantom [35]

If you were to find the constant rate, you would have to take 4.5 and divide it into 234 to get the answer

You would get 52 as the constant speed