Posted by **saira** on Monday, February 16, 2009 at 5:56pm.

solve the linear system using substitution. please show me the steps!:)

x-y=-5

2x-y=-7

- gr.10 math -
**Reiny**, Monday, February 16, 2009 at 6:09pm
arrange the first equation to x = y-5

sub replace the x in the second equation with that expression

2x-y=-7

2(y-5) - y = -7

2y - 10 - y = -7

y = -7 + 10

y = 3 , now let's put that back into x = y-5

x = 3 - 5

x = -2

so x = -2, y = 3

check in the first:

is -2 - (3) = -5 ? , yes!

in the second:

is 2(-2) - (3) = -7 ? , yes!

## Answer this Question

## Related Questions

- Math - solve the system of linear equations using the addition method. Can you ...
- Algebra - Solve the system of equations using substitution. x + 4y = -5 3x - 8y...
- Math - I SERIOUSLY need help! Solve the linear system by using substitution. x=6...
- Linear Equations - Can you please help solve this equation using the ...
- Algebra HELP - USE LINEAR COMBINATIONS TO SOLVE THE SYSTEM OF LINEAR EQUATIONS (...
- maths - use the substitution method to solve the linear system. 1. 3x=9 -x+2y=9 ...
- algebra 1 - use the substitution method to solve the linear system. 9x+6y=3 3x-...
- Algebra - solving linear equations w/ substitution - The question in the book ...
- Algebra II - Solve the given system by using a substitution method 9x-2y=3 3x-6=...
- math - y=5x-7 and -3x-2y=-12 I have to find the linear system using substitution...

More Related Questions