If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to x from the first equation is substituted into the second equation.

x + 4y = –9
2x + 5y = –6

2x + 5(4y – 9) = –6
2x + 5(–4y – 9) = –6
2(4y – 9) + 5y = –6
2(–4y – 9) + 5y = –6

Question

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to x from the first equation is substituted into the second equation.

x + 4y = –9 
2x + 5y = –6

2x + 5(4y – 9) = –6
2x + 5(–4y – 9) = –6
2(4y – 9) + 5y = –6
2(–4y – 9) + 5y = –6

anonymous · Answer

explain?

anonymous · Answer

when you solve for x it would look like this
x+4y=-9
    -4y  -4y
x=-4y-9

anonymous · Answer

substitution just means making it all into one of the variables so when you solved for x you can plug that into your second equation.
actually told you wrong sorry.
2(-4y-9)+5y=-6