Question

PLEASE HELP ASAP, FOUR MATH PROBLEMS, solving linear equations, using elimination and subtraction method

1.
y=-x+5
x-4y=10
this one is substitution method

2.
2x-5y=6
2x+3y=-2
elimination method

3.
y=x+5
2y=2x+10
substitution method

4.
y=4x-3
y=x+6
substitution method

please help, i really need it, thank you <3

Answer 1

Answer:1. (-10,-5)

2.(1/2,-1) 3. All real numbers infinite solution 4.(3 9)

Explanation:

Answer 2

Substitution means making one formula equal to a variable in the second formula to plug it in, and elimination means the cancelling out of one variable in order to make it easy to solve.

1. x-4(-x+5)=10

x+4x-20=10

5x=30

x=6, plug in 6 into original equation, y=-1

2. -1(2x-5y=6)

2x+3y=-2 underlined means cancelled, so you add the rest up on each side

5y+3y=-6+-2

8y=-8

y=-1, plug in this value to original equation, x=.5

3. 2(x+5)=2x+10

2x+10=2x+10

Infinite solutions

4. y=4x-3

-4(y=x+6) underlined means cancelled

-3y=-27

y=9, plug into original, x=3