Linear equations

[agile yew]

how do I solve question 9b?

[west dragon]

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[errant tusk]

similar to all the other ones?

find slope

then solve ffor b

[agile yew]

what do u mean? It is because i have trouble doing the downwards slope. Upwards slopes r fine for me though. Idk why

o and i meant 8b

[tired shell]

Solve for m using m=(y2-y1)/(x2-x1)

Or rise/run, comparing given points

Then substitute point (given) back into equation to solve for c

[kindred pebble]

Basically equation is y=mx+c so first find gradient then substitute the values to find c. And now you have the equation of the line

Y equals gradient x plus c

[errant tusk]

same process for downwards/upwards

take the two points subtract

and then I would just add a negative sign off of inspection