Question

Solve :-7x-6y=4
When x=-3y+8

Answer 1

simultaneous equation :
replace x with x,
-7(-3y+8)-6y=4
21y-56-6y=4
now collect like terms,
21y-6y=4+56
15y=60
divide both sides by 15,
y=4
now replace y with 4 to find x,
x=-3(4)+8
x=-4

Answer 2

Sub x into -7x-6y=4,
And solve for y:
-7(-3y+8)-6y=4
21y- 56-6y =4
15y =60
Y = 60/15 = 4
And then sub y=4 in to our eqn for x to get:
x = -3(4) +8
x = -4
So we have solutions to our equations, x =-4 and y = 4 or in Cartesian form (-4,4)