Solve the following system of equations graphically: -3x=-21 -8x-7y=0

Question

answer should not be a point, should be a real number

Answer 1

-3x =-21

x =-21/-3 = 7

x=7 graphically is a vertical line

-8x-7y = 0

-7y = 8x

y = 8x/-7 = (-8/7)x is a straight line with negative slope =-8/7 and y intercept = x intercept = the origin (0,0)

the lines intersect when x=7

y = -8x/7 = -8(7)/7 = -8

-8 is probably the real number you're looking for.

the two lines intersect at the point (7,-8) in quadrant IV