Question

For the following system, use the second equation to make a substitution for x in the first equation.

3x + 2y = 7
x - y + 3 = 0

What is the resulting equation?


3x - y - 3 + 2y = 7
3(y - 3) + 2y = 7
3y - 3 + 2y = 7

i got a

Answer 1

write somthing real quick

Answer 2

just a letter

Answer 3

When you times something in a bracket, you need to times the whole thing
E1 3x + 2y = 7
E2 x-y+3 = 0

It should be
x - y + 3 = 0
x - y = -3
x = y- 3

Sub in to e 1
3(y - 3) + 2y = 7
3y - 9 + 2y = 7
5y = 16
y = 16/5

Sub back into e 2 to find x
x - 16/5 + 3 = 0
x - 16/5 = -3
x = -3 + 16/5
x = 1/5

Check using e 2
3(1/5) + 2(16/5) = 7
3/5 + 32/5 = 7
35/5 = 7

Answer 4

k bye thanks its b i figured it out

Answer 5

So it is b

Answer 6

yeh

Answer 7

Sorry....I thought we have to do the whole thing... And then I look at the question again and I am like " oh...... "