How do you solve the system of equations 9x + y = 8 and - 7x - 2y = 6?
3 Answers
Explanation:
multiply for 2 the equation (1)
now adding both equations
for y just replace in any equation
in (1)
Explanation:
9x+y=8to(1)
-7x-2y=6to(2)
"from equation "(1)
y=8-9xto(3)
"substitute "y=8-9x" in equation "(2)
-7x-2(8-9x)=6
rArr-7x-16+18x=6
rArr11x-16=6
"add 16 to both sides"
rArr11x=22
"divide both sides by 11"
rArrx=2
"substitute "x=2" in equation "(3)
rArry=8-18=-10
"point of intersection "=(2,-10)
See a solution process below:
Explanation:
Step 1) Solve the first equation for
Step 2) Substitute
Step 3) Substitute
The Solution Is:
Or