Answer: y intercept (0,-15), x intercept (5,0), yes, (2,-9) is a solution
Explanation:
the y intercept is when x=0, so plug in 0 for x -> y=3(0)-15
y=-15, y intercept is (0,-15)
the x intercept is when y=0
so plug in 0 for y -> 0=3x-15
then solve for x,
add 15 to both sides -> 15=3x
divide both sides by 3, 5=x
x intercept is (5, 0)
to test if (2, -9) solution, lets plug in 2 for x and see if we get an answer of -9
so y=3(2)-15
y=6-15
y=-9
so yes, (2,-9) is a real solution