Equation of a line

[acoustic sphinx]

I got up to -1/2a as the gradient and y = -x/b + 12/b as the equation of the line

but i have no idea what to do next

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[thorn river]

make a pair of simultaneous equations

[acoustic sphinx]

how would you do that

using y-y1 = m(x-x1) ?

[thorn river]

you have 2 points where the equation passes through

substitute the y and x values in the equation of line l

and you have a pair of simultaneous equations with a and b

for example

7a + 5b - 12 = 0