Answer:
x=3, y=-1
Step-by-step explanation:
We are already given an equation solved for x, making substitution much easier. We know x=4y+7, meaning we can put 4y+7 whenever we see x in the second equation
2x-6y=12
We substitute 4y+7 in place of x
2(4y+7)-6y=12
Now we only have one variable to work on, distribute the 2
8y+14-6y=12
Combine similar terms, 8y-6y=2y
2y+14=12
Subtract 14 from both sides
2y=-2
y=-1
Now we plug in -1 for y in the first equation to find x
x=4(-1)+7
x=-4+7
x=3
Answer:
4 miles
Step-by-step explanation:
The problem gives you your rate. Use the rate that is given to you and then multiply that by 1
Tony can walk 4 miles in one hour
The answer is c hope it helps:)
Shaquira sold two pens and 3 erasers at a garage sale. She got $10 in total. Write an equation that shows the relation to the total cost and the objects
Answer:
1200
Step-by-step explanation:
n = 0.08 r + 7400
n = 7496, r = ?
7496 = 0.08r + 7400
7496 - 7400 = 0.08r
96 = 0.08r
r = 96/0.08
r = 1200
