X+y=57
y=x+15
x+x+15=57
2x=42
x=21
y=21+15
y=36
Idk your best bet is to look it up online thats what i do often
Answer is in The picture attached. Hope it helps!
Vertex = 2, -9
Intercept = 0, -5
You can find this by distributing the parenthesis and then finding the vertex using -b/2a.
