Question

Whats the y intercept of the line that passes through the point (3,-7) and (-1,9) woos CooperP -.-

Answer 1

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Answer 2

you'll need an equation to solve y
y=mx+c
to find the equation, you'll need the gradient/slope, which is 'm' on the equation above

so


your gradient is -4
and so y=-4x+c

to find the c, which is your y-intercept, simply substitute in the x and y from either points
i'll go with the (3,-7) one

y=mx+c
y=-4x+c
-7=-4(3)+c
-7+4(3)=c

can you solve for c (y intercept)?