Question

How many solutions? 3x+2x=20 and y+9=8x

Answer 1

@Hero?

Answer 2

Is there supposed to be a y variable in the first equation?

Answer 3

oh yeah sorry it is 3x + 2y = 20... Sorry

Answer 4

3x + 2y = 20
y = 8x - 9

Use substitution to solve

Answer 5

ok... uh I dont know x. What am I 'sposed to do?

Answer 6

well no need to solve if you need number of solutions.
Since they are the straight lines with different slopes it will intersect at only one point

Answer 7

Substitute the expression for y into the first equation
3x + 2(8x - 9) = 20

Then solve for x, then solve for y.

Answer 8

If you only need to know the number of solutions, then two lines always intersect at a single point.

Answer 9

yesh ok thanks! Cant believe i missed that! :(