A system of equations has no solution. If y = 8x + 7 is one of the equations, which could be the other equation?

y = 8x + 7
y = 8x – 7
y = –8x + 7
y = –8x – 7

Question

A system of equations has no solution. If y = 8x + 7 is one of the equations, which could be the other equation?

y = 8x + 7
y = 8x – 7
y = –8x + 7
y = –8x – 7

welshfella · Answer

Hint:-  Equations that form lines parallel to each other have no solution
Parallel  means they have the same slope.

consider the general form y = mx + b
- m is the value of the slope.

welshfella · Answer

which  equation has the same slope as y = 8x + 7?

welshfella · Answer

ignore y = 8x + 7 as it is the same equation as in the question

welshfella · Answer

compare y = 8x + 7 with the other 3 choices

karolynxx · Answer

i still dont understand

mayankdevnani · Answer

is it multiple choice question ?

karolynxx · Answer

yes the choices are at the bottom

mayankdevnani · Answer

i mean there are more than one correct answers

karolynxx · Answer

the anwsers are

a.y = 8x + 7
b.y = 8x – 7
c.y = –8x + 7
d.y = –8x – 7

karolynxx · Answer

cant be more then one

mayankdevnani · Answer

but it should be more than one

mayankdevnani · Answer

so i'll tell you method how to solve this type of question

welshfella · Answer

@karolynxx - just check out the number which multiplies x 
in the case of y = 8x + 7  its 8
what other equation has 8x in it?

welshfella · Answer

- its easier than you think