Need quick math help!

[twistedlegato]

I know this is probabley very easy for most of you, but let i remind you, i am in pre-algabra, though i am in a gifted class!

Given the equations, determine the slope of the line.
Give the y-intercept.

1) 5x+2y=7


2)7x+3y=9


Thanks alot!

 

[72930]

-2.5 gradient, 3.5

-7/3 gradient, 3

 

[twistedlegato]

-2.5 gradient, 3.5

-7/3 gradient, 3

Can you explain?

 

[®îçhå®?]

1) 5x+2y=7
2)7x+3y=9

1. Gradient -2.5, y intercept 3.5
2.Gradient -2 and 1/3, y intercept 3
Is this correct or am i being really stupid??

Rats just beaten. Make the integer infront of y=1.
y= mx + c where m is the gradient and c is the y intercept. Make x=0 and the y intercept is obvious and the gradient is the integer infront of the x. Is this explained well enough??

 

[72930]

Can you explain?

There are two ways to find gradient and point of intercept. The easiest for this solution is:

y=mx + c

(m being the gradient, and c the y intercept)

rearrange the equations to y=....
find the number of x's (this is the gradient, and the other number, the y intercept)

1. y= -2.5x + 3.5
2. y= -7/3x + 3

 

[72930]

1. Gradient 2.5, y intercept 3.5
2.Gradient 2 and 1/3, y intercept 3
Is this correct or am i being really stupid??

Too late biznitchwizzle....oh how I've longed to say that...

 

[twistedlegato]

I still dont get it, any way easier?

 

[®îçhå®?]

Again, can you tell me how you figured this out?

By doing AS level maths and being taught it (and also being in an express set)

 

[bearbo]

Can you explain?

5x + 2y = 7
=>2y = 7-5x
=>y = 3.5-2.5x

3.5 is intercept, -2.5 is slope

7x + 3y = 9
=>3y = 9 - 7x
=> y = 3 - 7/3x

3 is intercept, -7/3 is slope

 

[twistedlegato]

5x + 2y = 7
=>2y = 7-5x
=>y = 3.5-2.5x

3.5 is intercept, -2.5 is slope

7x + 3y = 9
=>3y = 9 - 7x
=> y = 3 - 7/3x

3 is intercept, -7/3 is slope

AHHHH!

I learned to do it with fraction, not decimals so i was cunfused!

Thanks everyone!