posted by .

Could you please check my answers we are using substitution to solve each system of equations. And at the end of every solution you are supposed to have an answer as a coordinate.

1. x=2y
x+y=3

2. 2y=3
x-y=10

3. y=x+7
x+2y= -21

4. 2y=x
x-y=10

5. x+y=0
4x+4y=0

6. 2x-y=6
3x-5y=9

7. 4x-y= -6
y+2=x

8. 4x-y= -3

9. x-5y=11
3x+y=7

10. x-2y=5
3x-5y=8

11. Laura and Ji- Yong were jogging on a 10 mile path. Laura had a 2-mile head start on Ju- Yong. If Laura ran at an average rate of 5 miles per hour and Ji-Yong ran at an average rate of 8 miles per hour, how long would it take for Ji-Yong to catch up with Laura.

I will #3 for you then follow the same method to do the rest

3. y=x+7
x+2y= -21

sub the first into the second:
x + 2(x+7) = -21
x + 2x + 14 = -21
3x = -35
x = -35/3
now sub that back into the first
y = -35/3 + 7 = -35/3 + 21/3 = -14/3

check:
in #1
LS = y = -14/3
RS = x+7 = -35/3 + 7 = -14/3

in #2
LS = x+2y = -35/3 + 2(-14/3) = -21
RS = -21

now work each one out the same way, and check your answer the same way.

• Please someone check this -

If you know how to do this substitution let me know but if you don't that's okay. Also, the last one I redid I got 52:30

x-2y=-1 -x+5y=4 x=-1 y=1

## Similar Questions

1. ### Geometry :(

this maths problem is wrecking my head.... 1.find the points of interesction of the line L and the circle k in the following L:x-2y=0 K:X Squared + y squared=25 I would solve both equations for y, and then you'll have a system with …
2. ### How do I do this.?(Math.)

Use the Substitution method to solve the system of equations. y - 2x = -5 3y - x = 5 Solve one of the equations for x or y. Let's solve the first one for y: y - 2x = -5 y = 2x - 5 Now let's substitute 2x - 5 for y in the second equation …
3. ### Algebra

I have a few questions that I need help with. Solve the radical equation, and check all proposed solutions. 5. x- square root 3x-2=4 I don't understand this problem. Solve and check the equation. 10. (x^2+14x+49)^3/4-20=7 would I have …

5. ### algebra

i need help with these problems (either a solution or how to plug them into a graphing calculator): 1) Solve by substitution or elimination 4/x + 1/y + 2/z = 4 2/x + 3/y - 1/z = 1 1/x + 1/y + 1/z = 4 2)Solve the system of equations …
6. ### Algebra 1

solve each system by substitution. check your answers 4y +3 = 3y +x and 2x +4y =18
7. ### Math Check

Hi! Can someone check my answers? Thanks! Directions: Solve each system by using the elimination method. Make sure to write your answer in (x,y) form. 1.) 3x-5y=2 2x+5y=13 2.) 3x+11y=4 -2x-5y=9 My answers: 1.) (3,7/5) 2.) (-17,5)
8. ### Algebra 1 check answers

If you were solving a system of equations and you came to a statement like 1 = 3, what do you know about the solution to the system?
9. ### Math (check plz)

y = 2x + 4 2x - y = 6 Solve the system of equations using substitution. A) (2,8) B) (2,-8) C) (10,24) D) no solution <-- 4x + 3y = 6 -4x + 2y = 14 olve the system of equations. A) x = 1/2, y = 3 B) x = 3, y = 1/2 <-- or D?
10. ### Algebra

3. What would be the simplest way to solve the system?

More Similar Questions