Question

Solve each of these systems using the substitution method. Make sure to check your answers !
2x + 3y = -4
x − 2y = 5
Answer

x = 1, y = -2

x = -1, y = 2

x = 1, y = 2

x = -2, y = -1

Answer 1

i cant see it.

Answer 2

uh x - 2y = 5

Answer 3

x = 1, y= -2?

Answer 4

x=2y-5

2x + 3y = -4
2(2y-5) +3y = -4

Answer 5

so the first one should be correct?

Answer 6

@bibby 5 + 2y

Answer 7

oops

Answer 8

I should not be mathing right now

Answer 9

@jjonty to use the substitution method using either of the equations find the expression for one of the variable in terms of the other then substitute in the other equation.
for this one @bibby is using the expression for x from the second equation to substitute in the first. please note it should be 5 + 2y
this gives one equation with one variable. after solving then substitute this value in either of the original equation to find the value of the other variable.

Answer 10

oh ok thnx

Answer 11

2(5 + 2y) + 3y = -4
10 + 4y + 3y = -4
y =

Answer 12

-2

Answer 13

good
now you have y and you know x = 5 + 2y so x = 5 + 2*-2 = 5-4 =

Answer 14

x = 1, y = -2

Answer 15

you got it

Answer 16

Ty

Answer 17

make sure to check your answers

you are welcome

Answer 18

i will :)