X+y=-13 and 4x+6y=-72

x=-3

y=-10

Step-by-step explanation:

X+y=-13 Equation 1

4x+6y=-72 Equation 2

Using substitution method

Make x the subject in equation 1

X=-13-y Equation 3

Substitute for x in equation 2

4x+6y=-72

4 (-13-y) + 6y=-72

-52-4y+6y=-72

-52+2y=-72

2y=-72+52

2y=-20

y=-20/2

y=-10

Substitute y for - 10 in equation 1

X+y=-13

X-10=-13

x=-13+10

x=-3

for x+y is 7+6or 6+7 for 4x+6y is 36+36