solve algebraically and check

y=8x+3
y=-4x-21

8x+3=-4x-21
+4x +4x
12x+3=-21
-3 -3
12x=-24
x=-2

y=8x+3
y=8(-2)+3
y=-16+3
y=-13
(-2,-13)
check
y=8x+3
-13=8(-2)+3
-13=-16+3
-13=-13

y=-4x-21
-13=-4(-2)-21
-13=8-21 so -13=-13
these check, so did I do this correctly?
Thanks for checking my work

2 answers

Correct

thank you